Department of
Environmental Quality

Subbasin Assessments and Total Maximum Daily Loads

Listed below are subbasins in which subbasin assessments (SBAs) and/or total maximum daily loads (TMDLs) have been completed for water bodies in DEQ's Boise Region. Click on the subbasin name to link to an overview of water quality in the subbasin, a list of streams and pollutants for which TMDLs were developed, and related documents, including subbasin assessments and TMDLs, addenda, implementation plans, and five-year reviews. (Access the statewide list of SBAs/TMDLs here.)

• Bissel Creek Subbasin
• Boise - Mores Creek Subbasin
• Boise River (Lower) Nutrient/Tributary Subbasin
• Boise River (Lower) Subbasin
• Boise River (South Fork) Subbasin
• Boise River (Upper) Subbasin
• Brownlee River (Weiser Flat) Subbasin
• Cascade Reservoir
• Jordan Creek Subbasin
• Little Salmon River Subbasin
• Owyhee (Upper) Subbasin
• Owyhee River (North and Middle Forks) Subbasin
• Owyhee River (South Fork) Subbasin
• Payette River (Lower) Subbasin
• Payette River, Middle Fork Subbasin
• Payette River, North Fork Subbasin
• Payette River, South Fork Subbasin
• Salmon River (Upper) Subbasin
• Salmon River, South Fork Subbasin
• Snake River - Hells Canyon Subbasin
• Snake River - King Hill-C.J. Strike Reservoir Subbasin
• Snake River (Middle) - Succor Creek Subbasin
• Weiser River Subbasin
• Wildhorse River Subbasin

Ground Water Studies and Reports

• Ada County Ground Water Quality Improvement and Drinking Water Source Protection Plan (2010)
• Assessment of Sources of Elevated Nitrate in Ground Water in Northwest Ada County County, Idaho, Using Environmental Isotopes
  (Technical Report 11. November 1999)
• Ground Water Investigation of Nitrate and Pesticides in Northwest Ada County, Idaho (Technical Report 10. July 1997)
• Ground Water Study of the Lower Boise River Valley, Ada and Canyon Counties, Idaho (May 1996)
• Lower Boise/Canyon County Nitrate Degraded Ground Water Quality Summary Report (December 2001)
• Preliminary Assessment of Hydrogeology and Water Quality in Ground Water in Canyon County, Idaho (February 2007)
• Canyon County Ground Water Study along the Boise River Corridor, Canyon County, Idaho (December 2000)
• Ground Water Quality Monitoring Results for the Purple Sage Study Area, Canyon County, Idaho (Technical Report 37. June 2009)
• Preliminary Hydrogeology of the Cascade Area, Valley County, Idaho (February 2005)
• Groundwater Quality Investigation and Wellhead Protection Study, City of Fruitland, Idaho (Technical Report 17. August 2000)
• Ground Water Quality Investigation and Wellhead Protection Study, Grand View, Idaho (Technical Report 16. October 2000)
• An Evaluation of Bacteria in Ground Water Near Mountain Home, Elmore County, Idaho (Technical Report 7. March 1996)
• Mountain Home South Ground Water Nitrate Study (Technical Report 36. May 2009)
• Western Estates, Nampa, Ground Water Report (February 2003)
• 2001 Annual Ground Water Quality Monitoring Summary Results for Northwest Owyhee County, Idaho (December 2002)
• Owyhee County Ground Water Quality Improvement and Drinking Water Source Protection Plan (March 2010)
• Ground Water and Soils Reconnaissance of the Lower Payette Area, Payette County, Idaho (Technical Report 5. December 1994)
• An Evaluation of Bacteria in Ground Water in Prairie, Elmore County, Idaho (Technical Report 8. August 1997)
• Scott Creek/Mann Creek Nitrate Degraded Ground Water Quality Summary Report (March 2002)
• Ground Water Vulnerability Assessment, Snake River Plain, Southern Idaho (Technical Report 2. April 1991)
• Idaho Snake-Payette Rivers Hydrologic Unit Ground Water Quality Assessment (Technical Report 3. July 1993)
• Treasure Valley Nutrient-Pathogen Validation Study (Technical Report 28. October 2006)
• Isotopic and Gelchemical Investigation in the Source of Elevated Uranium Concentrations in the Treasure Valley Aquifer, Idaho (April 2011)
  
• An Evaluation of Arsenic in Ground Water in a Portion of Washington County, Idaho (Technical Report 6. September 1995)
• Sunnyside Ground Water Monitoring Project Report: Former Sunnyside Feedlot and Vicinity, Weiser, Idaho (Technical Report 35. January 2009)
• Arena Valley Ground Water Quality, Wilder Area, Idaho (Technical Report 26. May 2006)

Surface Water Studies and Reports

• Boise River, Lower: Indian, Mason, Sand Hollow, Fivemile, Tenmile, and Fifteenmile Creeks: Designation Revisions (November 2004) and EPA Approval Letter
• Cascade Lake Lake*A*Syst - A Program to Help You Keep Lake Cascade Clean (August 2006)
• Jordan Creek and Non-Jordan Creek Sites: Analysis of Total Mercury Concentrations in Fish Samples (November 2009)