Water Body Name: | Cow Head Slough |
Water Body ID: | CAR6420001120080811005235 |
Water Body Type: | River & Stream |
Lines of Evidence (LOEs) for Decision ID 13724 |
LOE ID: | 25760 |
Pollutant: | Dissolved oxygen saturation |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Bureau of Land Management sampled this station in July 2002. The dissolved oxygen saturation in one sample was 62 percent. |
Data Reference: | Water quality data for surface waters on U.S Bureau of Land Management lands in Lassen and Modoc Counties. |
Water Quality Objective/Criterion: | The applicable objective from the Lahontan Basin Plan states: "The dissolved oxygen concentration shall not be depressed by more than 10 percent, below 80 percent saturation, or below 7.0 mg/L at any time, whichever is more restrictive." (Note: this is a watershed-specific narrative objective that differs from the regionwide objectives in Basin Plan Table 3-6.) |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station was sampled. |
Temporal Representation: | One sample was taken on July 22, 2002. |
Environmental Conditions: | Cow Head Slough is the natural outlet stream of Cow Head Lake in northeastern Modoc County, and flows north into Oregon. (Although the spelling "Cowhead" is used in the Basin Plan and other documents, the correct geographic name uses two words.) The lake and slough have been hydromodified for agriculture and the lake bed is now pumped dry so that crop can be grown upon it. The slough and irrigation canals on the lake bed are habitat for the fish subspecies Cowhead Lake tui chub, a California Species of Special Concern found only in this watershed. Cow Head Slough is designated for both the Warm Freshwater Habitat and Cold Freshwater Habitat beneficial uses, and for the Rare, Threatened or Endangered Species and the Spawning, Reproduction and Development uses. |
QAPP Information: | No quality assurance information was submitted with the data. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 13725 |
LOE ID: | 25764 |
Pollutant: | Nitrate |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Aquatic Life Use: | Marine Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Bureau of Land Management sampled this station in July 2002. The concentration of NO3-N in one sample was 0.07 mg/L |
Data Reference: | Water quality data for surface waters on U.S Bureau of Land Management lands in Lassen and Modoc Counties. |
Water Quality Objective/Criterion: | The Lahontan Basin Plan does not include site specific objectives for this water body. The regionwide narrative objective for biostimulatory substances states:
"Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect the water for beneficial uses." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station was sampled. |
Temporal Representation: | One sample was taken on July 22, 2002. |
Environmental Conditions: | Cow Head Slough is the natural outlet stream of Cow Head Lake in northeastern Modoc County, and flows north into Oregon. (Although the spelling "Cowhead" is used in the Basin Plan and other documents, the correct geographic name uses two words.) The lake and slough have been hydromodified for agriculture and the lake bed is now pumped dry so that crop can be grown upon it. The slough and irrigation canals on the lake bed are habitat for the fish subspecies Cowhead Lake tui chub, a California Species of Special Concern found only in this watershed. Cow Head Slough is designated for both the Warm Freshwater Habitat and Cold Freshwater Habitat beneficial uses, and for the Rare, Threatened or Endangered Species and the Spawning, Reproduction and Development uses. |
QAPP Information: | No quality assurance information was submitted with the data. |
QAPP Information Reference(s): | |
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LOE ID: | 25763 |
Pollutant: | Nitrate |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 1 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Bureau of Land Management sampled this station in July 2002. The concentration of NO3-N in one sample was 0.07 mg/L. The MCL was not exceeded. |
Data Reference: | Water quality data for surface waters on U.S Bureau of Land Management lands in Lassen and Modoc Counties. |
Water Quality Objective/Criterion: | California Maximum Contaminant Levels apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The MCL for nitrate is 45 mg/L expressed "as nitrate," equivalent to 10 mg/L expressed "as N.". |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station was sampled. |
Temporal Representation: | One sample was taken on July 22, 2002. |
Environmental Conditions: | Cow Head Slough is the natural outlet stream of Cow Head Lake in northeastern Modoc County, and flows north into Oregon. (Although the spelling "Cowhead" is used in the Basin Plan and other documents, the correct geographic name uses two words.) The lake and slough have been hydromodified for agriculture and the lake bed is now pumped dry so that crop can be grown upon it. The slough and irrigation canals on the lake bed are habitat for the fish subspecies Cowhead Lake tui chub, a California Species of Special Concern found only in this watershed. Cow Head Slough is designated for both the Warm Freshwater Habitat and Cold Freshwater Habitat beneficial uses, and for the Rare, Threatened or Endangered Species and the Spawning, Reproduction and Development uses. |
QAPP Information: | No quality assurance information was submitted with the data. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 13726 |
LOE ID: | 25759 |
Pollutant: | Oxygen, Dissolved |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Bureau of Land Management sampled this station in July 2002. The dissolved oxygen concentration in one sample was 5.57 mg/L. |
Data Reference: | Water quality data for surface waters on U.S Bureau of Land Management lands in Lassen and Modoc Counties. |
Water Quality Objective/Criterion: | The applicable water quality objective (from Lahontan Basin Plan Table 3-6) is a 1 day minimum dissolved oxygen concentration of 8 mg/L. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station was sampled. |
Temporal Representation: | One sample was taken on July 22, 2002. |
Environmental Conditions: | Cow Head Slough is the natural outlet stream of Cow Head Lake in northeastern Modoc County, and flows north into Oregon. (Although the spelling "Cowhead" is used in the Basin Plan and other documents, the correct geographic name uses two words.) The lake and slough have been hydromodified for agriculture and the lake bed is now pumped dry so that crop can be grown upon it. The slough and irrigation canals on the lake bed are habitat for the fish subspecies Cowhead Lake tui chub, a California Species of Special Concern found only in this watershed. Cow Head Slough is designated for both the Warm Freshwater Habitat and Cold Freshwater Habitat beneficial uses, and for the Rare, Threatened or Endangered Species and the Spawning, Reproduction and Development uses. |
QAPP Information: | No quality assurance information was submitted with the data. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 13733 |
LOE ID: | 25766 |
Pollutant: | Phosphate |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Bureau of Land Management sampled this station in July 2002. The concentration of PO4-P in one sample was 0.03 mg/L |
Data Reference: | Water quality data for surface waters on U.S Bureau of Land Management lands in Lassen and Modoc Counties. |
Water Quality Objective/Criterion: | The Lahontan Basin Plan does not include site specific objectives for this water body. The regionwide narrative objective for biostimulatory substances states:
"Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect the water for beneficial uses." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station was sampled. |
Temporal Representation: | One sample was taken on July 22, 2002. |
Environmental Conditions: | Cow Head Slough is the natural outlet stream of Cow Head Lake in northeastern Modoc County, and flows north into Oregon. (Although the spelling "Cowhead" is used in the Basin Plan and other documents, the correct geographic name uses two words.) The lake and slough have been hydromodified for agriculture and the lake bed is now pumped dry so that crop can be grown upon it. The slough and irrigation canals on the lake bed are habitat for the fish subspecies Cowhead Lake tui chub, a California Species of Special Concern found only in this watershed. Cow Head Slough is designated for both the Warm Freshwater Habitat and Cold Freshwater Habitat beneficial uses, and for the Rare, Threatened or Endangered Species and the Spawning, Reproduction and Development uses. |
QAPP Information: | No quality assurance information was submitted with the data. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 13728 |
LOE ID: | 25767 |
Pollutant: | Sediment |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Bureau of Land Management sampled this station in July 2002. The concentration of suspended sediment in one sample was 48.6 mg/L |
Data Reference: | Water quality data for surface waters on U.S Bureau of Land Management lands in Lassen and Modoc Counties. |
Water Quality Objective/Criterion: | The Lahontan Basin Plan's narrative objective states:
"The suspended sediment load and suspended sediment discharge rate of surface waters shall not be altered in such a manner as to cause nuisance or adversely affect the water for beneficial uses." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station was sampled. |
Temporal Representation: | One sample was taken on July 22, 2002. |
Environmental Conditions: | Cow Head Slough is the natural outlet stream of Cow Head Lake in northeastern Modoc County, and flows north into Oregon. (Although the spelling "Cowhead" is used in the Basin Plan and other documents, the correct geographic name uses two words.) The lake and slough have been hydromodified for agriculture and the lake bed is now pumped dry so that crop can be grown upon it. The slough and irrigation canals on the lake bed are habitat for the fish subspecies Cowhead Lake tui chub, a California Species of Special Concern found only in this watershed. Cow Head Slough is designated for both the Warm Freshwater Habitat and Cold Freshwater Habitat beneficial uses, and for the Rare, Threatened or Endangered Species and the Spawning, Reproduction and Development uses. |
QAPP Information: | No quality assurance information was submitted with the data. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 13727 |
LOE ID: | 25757 |
Pollutant: | Specific Conductance |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 1 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Bureau of Land Management sampled this station in July 2002. A single specific conductance measurement was 302 uS/cm. |
Data Reference: | Water quality data for surface waters on U.S Bureau of Land Management lands in Lassen and Modoc Counties. |
Water Quality Objective/Criterion: | California Maximum Contaminant Levels (MCLs) apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The MCL for specific conductance is 900 microsiemens per centimeter (uS/cm). |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station was sampled. |
Temporal Representation: | One specific conductance measurement was taken on July 22, 2002. |
Environmental Conditions: | Cow Head Slough is the natural outlet stream of Cow Head Lake in northeastern Modoc County, and flows north into Oregon. (Although the spelling "Cowhead" is used in the Basin Plan and other documents, the correct geographic name uses two words.) The lake and slough have been hydromodified for agriculture and the lake bed is now pumped dry so that crop can be grown upon it. The slough and irrigation canals on the lake bed are habitat for the fish subspecies Cowhead Lake tui chub, a California Species of Special Concern found only in this watershed. Cow Head Slough is designated for both the Warm Freshwater Habitat and Cold Freshwater Habitat beneficial uses, and for the Rare, Threatened or Endangered Species and the Spawning, Reproduction and Development uses. |
QAPP Information: | No quality assurance information was submitted with the data. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 13729 |
LOE ID: | 25765 |
Pollutant: | Temperature, water |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Bureau of Land Management sampled this station in July 2002. The temperature in one sample was 20.86 degrees Celsius. |
Data Reference: | Water quality data for surface waters on U.S Bureau of Land Management lands in Lassen and Modoc Counties. |
Water Quality Objective/Criterion: | The temperature objective in the Lahontan Basin Plan states: "The natural receiving water temperature of all waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such an alteration in temperature does not adversely affect the water for beneficial uses.
For waters designated WARM, water temperature shall not be altered by more than five degrees Fahrenheit ... above or below the natural temperature. For waters designated COLD, the temperature shall not be altered. Temperature objectives for COLD interstate waters and WARM interstate waters are as specified in the 'Water Quality Control Plan for Control of Temperature in The Coastal and Interstate Waters and Enclosed Bays and Estuaries of California' including any revisions." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station was sampled. |
Temporal Representation: | One sample was taken on July 22, 2002. |
Environmental Conditions: | Cow Head Slough is the natural outlet stream of Cow Head Lake in northeastern Modoc County, and flows north into Oregon. (Although the spelling "Cowhead" is used in the Basin Plan and other documents, the correct geographic name uses two words.) The lake and slough have been hydromodified for agriculture and the lake bed is now pumped dry so that crop can be grown upon it. The slough and irrigation canals on the lake bed are habitat for the fish subspecies Cowhead Lake tui chub, a California Species of Special Concern found only in this watershed. Cow Head Slough is designated for both the Warm Freshwater Habitat and Cold Freshwater Habitat beneficial uses, and for the Rare, Threatened or Endangered Species and the Spawning, Reproduction and Development uses. |
QAPP Information: | No quality assurance information was submitted with the data. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 13736 |
LOE ID: | 25762 |
Pollutant: | Turbidity |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 1 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Bureau of Land Management sampled this station in July 2002. The turbidity in one sample was 43.5 NTU. |
Data Reference: | Water quality data for surface waters on U.S Bureau of Land Management lands in Lassen and Modoc Counties. |
Water Quality Objective/Criterion: | California Maximum Contaminant Levels apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The MCL for turbidity is 5 NTU. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station was sampled. |
Temporal Representation: | One turbidity measurement was taken on July 22, 2002. |
Environmental Conditions: | Cow Head Slough is the natural outlet stream of Cow Head Lake in northeastern Modoc County, and flows north into Oregon. (Although the spelling "Cowhead" is used in the Basin Plan and other documents, the correct geographic name uses two words.) The lake and slough have been hydromodified for agriculture and the lake bed is now pumped dry so that crop can be grown upon it. The slough and irrigation canals on the lake bed are habitat for the fish subspecies Cowhead Lake tui chub, a California Species of Special Concern found only in this watershed. Cow Head Slough is designated for both the Warm Freshwater Habitat and Cold Freshwater Habitat beneficial uses, and for the Rare, Threatened or Endangered Species and the Spawning, Reproduction and Development uses. |
QAPP Information: | No quality assurance information was submitted with the data. |
QAPP Information Reference(s): | |
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LOE ID: | 25761 |
Pollutant: | Turbidity |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Bureau of Land Management sampled this station in July 2002. The turbidity in one sample was 43.5 NTU. |
Data Reference: | Water quality data for surface waters on U.S Bureau of Land Management lands in Lassen and Modoc Counties. |
Water Quality Objective/Criterion: | The Lahontan Basin Plan's regionwide turbidity objective states: "Waters shall be free of changes in turbidity that cause nuisance or adversely affect the water for beneficial uses. Increases in turbidity shall not exceed natural levels by more than 10 percent." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station was sampled. |
Temporal Representation: | One turbidity measurement was taken on July 22, 2002. |
Environmental Conditions: | Cow Head Slough is the natural outlet stream of Cow Head Lake in northeastern Modoc County, and flows north into Oregon. (Although the spelling "Cowhead" is used in the Basin Plan and other documents, the correct geographic name uses two words.) The lake and slough have been hydromodified for agriculture and the lake bed is now pumped dry so that crop can be grown upon it. The slough and irrigation canals on the lake bed are habitat for the fish subspecies Cowhead Lake tui chub, a California Species of Special Concern found only in this watershed. Cow Head Slough is designated for both the Warm Freshwater Habitat and Cold Freshwater Habitat beneficial uses, and for the Rare, Threatened or Endangered Species and the Spawning, Reproduction and Development uses. |
QAPP Information: | No quality assurance information was submitted with the data. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 13731 |
LOE ID: | 25758 |
Pollutant: | pH |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Bureau of Land Management sampled this station in July 2002. One pH measurement was 8.1 units. |
Data Reference: | Water quality data for surface waters on U.S Bureau of Land Management lands in Lassen and Modoc Counties. |
Water Quality Objective/Criterion: | The Lahontan Basin Plan's regionwide water quality objective states: "In fresh waters with designated beneficial uses of COLD or WARM, changes in normal ambient pH levels shall not exceed 0.5 pH units. For all other waters of the region, the pH shall not be depressed below 6.5 nor raised above 8.5 units.
The Regional Board recognizes that some waters of the Region may have natural pH levels outside of the 6.5 to 8.5 range. Compliance with the pH objective for these waters will be determined on a case-by-case basis." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station was sampled. |
Temporal Representation: | One pH measurement was taken on July 22, 2002. |
Environmental Conditions: | Cow Head Slough is the natural outlet stream of Cow Head Lake in northeastern Modoc County, and flows north into Oregon. (Although the spelling "Cowhead" is used in the Basin Plan and other documents, the correct geographic name uses two words.) The lake and slough have been hydromodified for agriculture and the lake bed is now pumped dry so that crop can be grown upon it. The slough and irrigation canals on the lake bed are habitat for the fish subspecies Cowhead Lake tui chub, a California Species of Special Concern found only in this watershed. Cow Head Slough is designated for both the Warm Freshwater Habitat and Cold Freshwater Habitat beneficial uses, and for the Rare, Threatened or Endangered Species and the Spawning, Reproduction and Development uses. |
QAPP Information: | No quality assurance information was submitted with the data. |
QAPP Information Reference(s): |