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TMDL Document for NEVADA CREEK - HEADWATERS TO NEVADA LAKE; MIDDLE BLACKFOOT TPA
| TMDL ID: | 35541 | TMDL Name: | NEVADA CREEK - HEADWATERS TO NEVADA LAKE; MIDDLE BLACKFOOT TPA | ||
| State/Tribe: | Montana | TMDL Date: | 09/23/2008 | ||
| EPA Action: | EPA Approved | Comments: | THE LOAD ALLOCATIONS IN THE TMDL INDICATE THAT FOREST ROADS, HAY PRODUCTION, TIMBER PRODUCTION, PLACER MINING AND LIVESTOCK GRAZING ARE THE MAIN CONTROLABLE SOURCES. NUTRIENT TMDLS CALCULATED FOR THE 25TH FLOW PERCENTILE (LOW FLOW) WHICH REPRESENTS GROWING SEASON CONDITIONS WHEN IMPAIRMENT OCCURS. THE METALS TMDLS ARE FLOW-BASED AND, THEREFORE, WILL VARY AS FLOW CHANGES. THE METALS LAS REPRESENT EXAMPLE HIGH FLOW CONDITIONS. HIGH FLOWS ARE CONSIDERED THE CRITICAL CONDITION DUE TO THE LINKAGE BETWEEN METALS LOADING AND SEDIMENT LOADING, WHICH OCCURS LARGELY DURING HIGH FLOW CONDITIONS. | ||
No TMDL Documents have been uploaded for this TMDL.
TMDL Pollutant: Copper
| Total Waste Load Allocation: | Total Load Allocation: | 6.13 | ||
| Explicit Margin Of Safety: | Implicit Margin Of Safety: | Y | ||
| Units for Total Waste Load Allocation and Total Load Allocation: | LBS/DAY | TMDL Pollutant Source Type: | Nonpoint Source | |
| TMDL End Point: | MAXIMUM INSTREAM COPPER CONCENTRATION ALLOWED BY CIRCULAR DEQ-7 AFTER ADJUSTMENT FOR HARDNESS. | |||
| Listed Water Causes of Impairment for Copper Click on the underlined Waterbody ID for a Waterbody Report. Click on the underlined "Waterbody Map" literal for a map of the Assessment Unit. |
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| Waterbody ID | Waterbody Name | Map | Cycles Listed | Cause(s) of Impairment Addressed | |
|---|---|---|---|---|---|
| MT76F003_011 | NEVADA CREEK | Waterbody Map | 2000, 2002, 2004, 2006, 2008, 2010, 2012 | Metals (other than Mercury) | |
TMDL Pollutant: Iron
| Total Waste Load Allocation: | Total Load Allocation: | 556 | ||
| Explicit Margin Of Safety: | Implicit Margin Of Safety: | Y | ||
| Units for Total Waste Load Allocation and Total Load Allocation: | LBS/DAY | TMDL Pollutant Source Type: | Nonpoint Source | |
| TMDL End Point: | MAXIMUM INSTREAM IRON CONCENTRATION OF 1.0 MG/L. | |||
| Listed Water Causes of Impairment for Iron Click on the underlined Waterbody ID for a Waterbody Report. Click on the underlined "Waterbody Map" literal for a map of the Assessment Unit. |
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| Waterbody ID | Waterbody Name | Map | Cycles Listed | Cause(s) of Impairment Addressed | |
|---|---|---|---|---|---|
| MT76F003_011 | NEVADA CREEK | Waterbody Map | 2000, 2002, 2004, 2006, 2008, 2010, 2012 | Metals (other than Mercury) | |
TMDL Pollutant: Lead
| Total Waste Load Allocation: | Total Load Allocation: | .17 | ||
| Explicit Margin Of Safety: | Implicit Margin Of Safety: | Y | ||
| Units for Total Waste Load Allocation and Total Load Allocation: | LBS/DAY | TMDL Pollutant Source Type: | Nonpoint Source | |
| TMDL End Point: | MAXIMUM INSTREAM LEAD CONCENTRATION ALLOWED BY CIRCULAR DEQ-7 AFTER ADJUSTMENT FOR HARDNESS. | |||
| Listed Water Causes of Impairment for Lead Click on the underlined Waterbody ID for a Waterbody Report. Click on the underlined "Waterbody Map" literal for a map of the Assessment Unit. |
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| Waterbody ID | Waterbody Name | Map | Cycles Listed | Cause(s) of Impairment Addressed | |
|---|---|---|---|---|---|
| MT76F003_011 | Nevada Creek | Waterbody Map | 2000, 2002, 2004, 2006, 2008 | Lead | |
TMDL Pollutant: Nitrogen, Total
| Total Waste Load Allocation: | Total Load Allocation: | 18 | ||
| Explicit Margin Of Safety: | Implicit Margin Of Safety: | Y | ||
| Units for Total Waste Load Allocation and Total Load Allocation: | LBS/DAY | TMDL Pollutant Source Type: | Nonpoint Source | |
| TMDL End Point: | MAXIMUM SEASONAL TN CONCENTRATIONS: GROWING SEASON - 0.33 MG/L. MEAN SUMMER BENTHIC CHL-A - 100 MG/M2; MAXIMUM BENTHIC CHL-A - 150 MG/M2. | |||
| Listed Water Causes of Impairment for Nitrogen, Total Click on the underlined Waterbody ID for a Waterbody Report. Click on the underlined "Waterbody Map" literal for a map of the Assessment Unit. |
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| Waterbody ID | Waterbody Name | Map | Cycles Listed | Cause(s) of Impairment Addressed | |
|---|---|---|---|---|---|
| MT76F003_011 | Nevada Creek | Waterbody Map | 2000, 2002, 2004, 2006, 2008 | Total Kjehldahl Nitrogen (TKN) | |
TMDL Pollutant: Phosphorus
| Total Waste Load Allocation: | Total Load Allocation: | .54 | ||
| Explicit Margin Of Safety: | Implicit Margin Of Safety: | Y | ||
| Units for Total Waste Load Allocation and Total Load Allocation: | LBS/DAY | TMDL Pollutant Source Type: | Nonpoint Source | |
| TMDL End Point: | MAXIMUM SEASONAL TP CONCENTRATIONS: GROWING SEASON - 0.01 MG/L. MEAN SUMMER BENTHIC CHL-A - 100 MG/M2; MAXIMUM BENTHIC CHL-A - 150 MG/M2. | |||
| Listed Water Causes of Impairment for Phosphorus Click on the underlined Waterbody ID for a Waterbody Report. Click on the underlined "Waterbody Map" literal for a map of the Assessment Unit. |
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| Waterbody ID | Waterbody Name | Map | Cycles Listed | Cause(s) of Impairment Addressed | |
|---|---|---|---|---|---|
| MT76F003_011 | NEVADA CREEK | Waterbody Map | 2000, 2002, 2004, 2006, 2008 | Nutrients | |
TMDL Pollutant: Sediment
| Total Waste Load Allocation: | Total Load Allocation: | 3501 | ||
| Explicit Margin Of Safety: | Implicit Margin Of Safety: | Y | ||
| Units for Total Waste Load Allocation and Total Load Allocation: | TONS/YEAR | TMDL Pollutant Source Type: | Nonpoint Source | |
| TMDL End Point: | B CHANNEL - RIFFLE SUBSTRATE: <6MM - <= 20%; RIFFLE SUBSTRATE: <2MM - <= 10%; MCNEIL CORES <6.35 MM - <= 27%; POOL FREQUENCY (POOLS/MILE) - >= 20; RESIDUAL POOL DEPTH (FT) - >= 0.6; MEDIAN W:D RATIO - 12-16; MEDIAN POOL TAILOUT SURFACE FINES < 6 MM - <= 17%; MCNEIL CORES <2MM - <= 12%; MCNEIL CORES <.85 MM - <= 6%; WOODY VEGETATION EXTENT - >= 88%; MACROINVERTEBRATE MULTI-METRIC INDEX - >= 48; RIVPACS OBSERVED/EXPECTED - >= 0.8; POOL EXTENT - >= 10%; WOODY DEBRIS AGGREGATE EXTENT - >= 3% C CHANNEL -RIFFLE SUBSTRATE: <6MM - <= 22%; RIFFLE SUBSTRATE: <2MM - <= 7%; MCNEIL CORES <6.35 MM - <= 27%; POOL FREQUENCY (POOLS/MILE) - >= 46; RESIDUAL POOL DEPTH (FT) - >= 2; MEDIAN W:D RATIO - 12-20 MEDIAN POOL TAILOUT SURFACE FINES < 6 MM - <= 23; WOODY VEGETATION EXTENT - >= 61%; ENTRENCHMENT RATIO - > 2.2; POOL EXTENT - >= 35%; WOODY DEBRIS AGGREGATE EXTENT (%) - >= 7. | |||
| Listed Water Causes of Impairment for Sediment Click on the underlined Waterbody ID for a Waterbody Report. Click on the underlined "Waterbody Map" literal for a map of the Assessment Unit. |
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| Waterbody ID | Waterbody Name | Map | Cycles Listed | Cause(s) of Impairment Addressed | |
|---|---|---|---|---|---|
| MT76F003_011 | Nevada Creek | Waterbody Map | 2000, 2002, 2004, 2006, 2008 | Suspended Solids | |
TMDL Pollutant: Temperature
| Total Waste Load Allocation: | Total Load Allocation: | 1070000 | ||
| Explicit Margin Of Safety: | Implicit Margin Of Safety: | Y | ||
| Units for Total Waste Load Allocation and Total Load Allocation: | KCAL/DAY | TMDL Pollutant Source Type: | Nonpoint Source | |
| TMDL End Point: | 73 PERCENT BANKLINE WOODY VEGETATION EFFECTIVE SHADE COMPARABLE TO REFERENCE CONDITIONS; AND WIDTH/DEPTH RATIO FOR C CHANNEL TYPE: 12-20. | |||
| Listed Water Causes of Impairment for Temperature Click on the underlined Waterbody ID for a Waterbody Report. Click on the underlined "Waterbody Map" literal for a map of the Assessment Unit. |
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| Waterbody ID | Waterbody Name | Map | Cycles Listed | Cause(s) of Impairment Addressed | |
|---|---|---|---|---|---|
| MT76F003_011 | NEVADA CREEK | Waterbody Map | Unlisted but Impaired | ||