Pend Oreille Lake (Nearshore Waters) Subbasin

Subbasin at a Glance

Hydrologic Unit Code	17010214
Size	44,740 acres
§303(d) Listed Stream Segments	Nearshore waters of Pend Oreille Lake
Beneficial Uses Affected	Water supply, recreation, salmonid spawning, cold water biota, wildlife habitat, aesthetics
Pollutants of Concern	Total phosphorus
Major Land Uses	Forestry, urban, shrubland, wetland, pasture/cropland
Date Approved by U.S. EPA	October 2002 EPA Approval Letter

Overview

Pend Oreille Lake is part of the Clark Fork-Pend Oreille Basin, which lies in western Montana, northern Idaho, and northeastern Washington. The Clark Fork River begins near Butte, Montana, and drains an extensive area of western Montana before entering Pend Oreille Lake, in Idaho, at the lake's northeast corner. The lake is the source of the Pend Oreille River in northeastern Washington, which ultimately drains to the Columbia River.

Pend Oreille Lake was placed on Idaho's 1994 §303(d) list as a "threatened" water body and retained on the 1996 and 1998 lists. Because of this listing, DEQ prepared a problem assessment for the lake, which recommended developing a TMDL for the nearshore waters of the lake to mitigate increasing eutrophication along the shoreline. This TMDL addresses this recommendation.

Streams and Pollutant for Which TMDLs Were Developed

Nearshore waters of Pend Oreille Lake: Total Phosphorus

Subbasin Documents

Total Maximum Daily Load (TMDL) for Nutrients for the Nearshore Waters of Pend Oreille Lake, Idaho (April 2002)
Pend Oreille Lake Nearshore Nutrient TMDL Implementation Plan (December 2004)

Department of
Environmental Quality

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