Water Quality Improvement Project
Lacamas Creek Area:


The Lacamas Creek watershed is about 67 square miles of forest, farm, residential, commercial, and industrial land. Located in southeastern Clark County, the watershed extends from the community of Hockinson on the north to the city of Camas on the south. The Elkhorn and Livingston Mountains form its eastern boundary. Most of the watershed is in unincorporated Clark County, but portions are in the city of Camas and the city of Vancouver. Lacamas Creek has five major tributaries: Matney Creek, Shanghai Creek, Fifth Plain Creek, China Ditch, and Dwyer Creek. There are also many smaller streams. Lacamas Creek flows about 12.5 miles from relatively undisturbed forest headwaters, through rural, agricultural, and residential areas, into Lacamas and Round Lakes. (see sub-watersheds map)

Beginning in the 1890s, several manmade channels were built in the area to drain wetlands for farmland and to increase the volume of water available to Camas mills. While considered an improvement when built, the unintended consequences of these channels are now apparent. With significantly fewer wetland areas to store runoff from rainstorms, higher volumes of stormwater are funneled more quickly into streams, eroding stream banks and causing increased flooding in low-lying lands. Stream health is best in the upland areas of relatively undisturbed forest, but declines markedly as streams flow through agricultural, suburban, and urban areas.

Water quality issues

Water quality has been monitored in the Lacamas Creek watershed since 1991. Based on data collected in 1991 and 1992 Lacamas, Dwyer, Fifth Plain, Matney and Shanghai Creeks, and China Ditch and China Lateral were included on the 1998 303(d) list, the listing of impaired surface waters in the state. Subsequent data collected by Clark County and Ecology show continued exceedances of water quality standards, and these creeks are included on the 2008 303(d) list. (See Study Area map)

Lacamas Creek, Washington State.  Photographer unknown.

Status of the project

The Lacamas Creek watershed was selected for a water quality improvement plan, also known as a total maximum daily load (TMDL), in summer 2009. A TMDL includes:

  • An assessment of the water quality problems.
  • A technical analysis to determine how much pollution must be reduced from all sources to meet water quality standards.
  • The selection and implementation of appropriate control measures.
  • Follow-up monitoring to determine the success of the effort.

The water quality assessment was done during the fall of 2010 and through the fall 2011. The assessment included intensive water-quality monitoring of Lacamas Creek and its tributaries, and included surface water, ground water, and stormwater. The monitoring data will be used to model current watershed conditions and various management scenarios. After the modeling is complete, Ecology will form a Lacamas Creek TMDL Advisory Committee comprised of city, county, and state governments, local citizens, and other stakeholders. The Advisory Committee will help Ecology develop a clean-up plan which explains the roles and authorities of clean-up partners, along with the programs or other means through which the water-quality issues will be addressed.

Why this matters

Technical information

Related information

Last updated April 2016
  Salmon-Washougal watershed map for water resource inventory area 28.


WRIA: #28 (Salmon-Washougal)
County: Clark

Water-body Name:
Lacamas Creek

Dissolved oxygen
Fecal coliform

# of TMDLs: ---

Under development

Contact Info:
Andrew Kolosseus
Phone: 360-407-7543
Email: Andrew Kolosseus@ecy.wa.gov

Southwest Region
Department of Ecology
Water Quality Program
PO Box 47775
Olympia, WA 98504-7775