Regional Board 6 - Lahontan Region	CATEGORY 4A	Final 2018 Integrated Report (CWA Section 303(d) List / 305(b) Report)
10/22/2019
2018 CALIFORNIA LIST OF WATER QUALITY LIMITED SEGMENTS
BEING ADDRESSED BY USEPA APPROVED TMDLS

Category 4A Criteria: 1) A water segment where ALL its 303(d) listings are being addressed; and 2) at least one of those listings is being addressed by a USEPA approved TMDL.

* USGS HUC = US Geological Survey Hydrologic Unit Code. Calwater = State Water Resources Control Board hydrological subunit area or even smaller planning watershed.

** "Addressed By" is defined as: B = Being addressed by USEPA approved TMDL and C = Being addressed by action(s) other than a TMDL

REGION	WATER BODY NAME	WATER TYPE	WATERSHED* CALWATER / USGS HUC	POLLUTANT POTENTIAL SOURCES Relevant Notes	ESTIMATED AREA ASSESSED	FIRST YEAR LISTED	ADDRESSED BY**	USEPA TMDL APPROVAL DATE
6	Bronco Creek	River & Stream	8635.200501,8635.200503  /  16050102	Sedimentation/Siltation Natural Sources Nonpoint Source Silviculture	1.2 Miles	1996	B	2009
6	Gray Creek (Nevada County)	River & Stream	8635.200502  /  16050102	Sedimentation/Siltation Natural Sources Nonpoint Source Silviculture	2.6 Miles	1996	B	2009
6	Indian Creek Reservoir	Lake & Reservoir	8632.200000  /  16050201	Oxygen, Dissolved Source Unknown	168 Acres	2012	B	2003
				Phosphorus Erosion/Siltation Flow Alteration/Regulation/Modification Internal Nutrient Cycling (primarily lakes) Pasture Grazing-Riparian and/or Upland Wastewater	168 Acres	2002	B	2003
				Reservoir is eutrophic. Most significant source of nutrient loading is release of phosphorus from sediment. The USEPA approved the TMDL in 2003. Reductions in internal phosphorus loading from the sediment are expected to ameliorate other problems associated with eutrophication.
6	Squaw Creek	River & Stream	8635.200101  /  16050102	Sedimentation/Siltation Construction/Land Development Drainage/Filling Of Wetlands Highway Maintenance and Runoff Hydromodification Natural Sources Nonpoint Source Other Urban Runoff Recreational and Tourism Activities (non-boating)	8.1 Miles	1998	B	2007
6	Tahoe, Lake	Lake & Reservoir	8634.100301,8634.100302,8634.100401,8634.100402,8634.200101,8634.200102,8634.200103,8634.200105,8634.200201,8634.200202,(Total Count: 16)  /  16050101	Nitrogen Atmospheric Deposition Channel Erosion Channelization Erosion/Siltation Grazing-Related Sources Highway Maintenance and Runoff Highway/Road/Bridge Construction Highway/Road/Bridge Runoff Internal Nutrient Cycling (primarily lakes) Land Development Natural Sources Nonpoint Source Other Urban Runoff Recreational and Tourism Activities (non-boating) Road Construction Sediment Resuspension (clean sediment) Silviculture Streambank Modification/Destabilization Urban Runoff--Erosion and Sedimentation	84092 Acres	2002	B	2011
				Phosphorus Atmospheric Deposition Channel Erosion Erosion/Siltation Grazing-Related Sources Highway Maintenance and Runoff Highway/Road/Bridge Construction Highway/Road/Bridge Runoff Internal Nutrient Cycling (primarily lakes) Land Development Natural Sources Nonpoint Source Other Urban Runoff Recreational and Tourism Activities (non-boating) Sediment Resuspension (clean sediment) Silviculture Streambank Modification/Destabilization Urban Runoff--Erosion and Sedimentation Urban Runoff--Non-industrial Permitted Urban Runoff/Storm Sewers	84092 Acres	2002	B	2011
				Sedimentation/Siltation Atmospheric Deposition Channel Erosion Channelization Erosion/Siltation Grazing-Related Sources Highway/Road/Bridge Construction Highway/Road/Bridge Runoff Hydromodification Land Development Natural Sources Nonpoint Source Other Urban Runoff Recreational and Tourism Activities (non-boating) Removal of Riparian Vegetation Sediment Resuspension (clean sediment) Silviculture Streambank Modification/Destabilization Urban Runoff--Erosion and Sedimentation Urban Runoff/Storm Sewers	84092 Acres	2006	B	2011