TMDL Document for LAIRD CREEK - BITTERROOT HEADWATERS PLANNING AREA

TMDL ID:	31443	TMDL Name:	LAIRD CREEK - BITTERROOT HEADWATERS PLANNING AREA
State/Tribe:	Montana	TMDL Date:	04/12/2006
EPA Action:	EPA Approved	Comments:	SUM OF THE ALLOCATIONS TO THE KNOWN HUMAN-CAUSED SEDIMENT SOURCES. THIS EQUATES TO A 2% REDUCTION IN TOTAL LOAD. THE MOST RECENT WATERBODY ID IS MTH002_080. ORIGINALLY ENTERED INTO NTTS AS ONE TMDL COMBINED WITH GILBERT CREEK (MT76H002_080)BECAUSE GILBERT CREEK IS A TRIBUTARY TO LAIRD CREEK AND THEY WERE LISTED FOR SAME REASONS. THAT CAUSED TRACKING PROBLEMS SO THEY WERE BROKEN OUT INTO TWO TMDLS ON 2/28/11.

TMDL Documents

Click on the underlined Document Type to retrieve the actual document in PDF format.
Document Type	Comments
TMDL Report

---

TMDL Pollutant: Siltation

Total Waste Load Allocation:			Total Load Allocation:
Explicit Margin Of Safety:			Implicit Margin Of Safety:	Y
Units for Total Waste Load Allocation and Total Load Allocation:			TMDL Pollutant Source Type:	Nonpoint Source
TMDL End Point:	% SUBSURFACE FINES , 2MM = 11-27% FOR B4 STREAM TYPES. % SUBSURFACE FINES , 6 MM = 16-38% FOR B4 STREAM TYPES. D50 = 7-64 MM FOR B4 STREAM TYPES. CLINGER RICHNESS >= 14. LA = 63% REDUCTION IN LOADING FROM ROADS, AND A 75% REDUCTION IN LOADING FROM HUMAN-CAUSED BANK EROSION. PLUS A PERFORMANCE-BASED ALLOCATION TO FUTURE SOURCES AND ADDITIONAL STUDY TO IDENTIFY OTHER POTENTIALLY SIGNIFICANT SOURCES.

Listed Water Causes of Impairment for Siltation Click on the underlined Waterbody ID for a Waterbody Report. Click on the underlined "Waterbody Map" literal for a map of the Assessment Unit.
Waterbody ID	Waterbody Name	Map	Cycles Listed	Cause(s) of Impairment Addressed
MT76H002_070	LAIRD CREEK	Data Unavailable	2000, 2002, 2004, 2006	Siltation

Top of page

---

TMDL Pollutant: Total Suspended Solids (TSS)

Total Waste Load Allocation:			Total Load Allocation:
Explicit Margin Of Safety:			Implicit Margin Of Safety:	Y
Units for Total Waste Load Allocation and Total Load Allocation:			TMDL Pollutant Source Type:	Nonpoint Source
TMDL End Point:	% SUBSURFACE FINES , 2MM = 11-27% FOR B4 STREAM TYPES. % SUBSURFACE FINES , 6 MM = 16-38% FOR B4 STREAM TYPES. D50 = 7-64 MM FOR B4 STREAM TYPES. CLINGER RICHNESS >= 14. LA = 63% REDUCTION IN LOADING FROM ROADS, AND A 75% REDUCTION IN LOADING FROM HUMAN-CAUSED BANK EROSION. PLUS A PERFORMANCE-BASED ALLOCATION TO FUTURE SOURCES AND ADDITIONAL STUDY TO IDENTIFY OTHER POTENTIALLY SIGNIFICANT SOURCES.

Listed Water Causes of Impairment for Total Suspended Solids (Tss) Click on the underlined Waterbody ID for a Waterbody Report. Click on the underlined "Waterbody Map" literal for a map of the Assessment Unit.
Waterbody ID	Waterbody Name	Map	Cycles Listed	Cause(s) of Impairment Addressed
MT76H002_070	Laird Creek	Data Unavailable	2000, 2002, 2004, 2006	Sedimentation/Siltation

Top of page

---