Mercer Slough Basin Drainage Details

Lake Washington Watershed (WRIA 8) / State Stream #08-0259

Updated: July 2017

The City of Bellevue does not guarantee that the information on this map is accurate or complete. This data is provided on an "as is" basis and disclaims all warranties.

Please check out the PDF fact sheet version

Land Characteristics

Basin Area
1,332 Total Acres
City Area
6.2%
Drainage Jurisdiction(s)
Bellevue: 100.0%
Beaux Arts: 0.0%
Clyde Hill: 0.0%
Issaquah: 0.0%
King County: 0.0%
Kirkland: 0.0%
Medina: 0.0%
Newcastle: 0.0%
Redmond: 0.0%
Renton: 0.0%
Lowest Elevation
16 Ft
Highest Elevation
467 Ft
Total Length of Open Channel
3.3 Miles
Total Length of Storm Drainage Pipes:
20.9 Miles

Salmon Present in the Basin

  • Chinook*+
  • Coho+
  • Sockeye
  • Rainbow & Cutthroat Trout
  • Steelhead (Lake only)

* Listed Federal Endangered Species
+ City Species of Local Importance (Bellevue Land Use Code 20.25H.150A)

Population

The population density in Bellevue ranges from 1,344 to 9,851 people per square mile.

Basin Population (2016)
4,900
% of all Basins
3.2%
Basin Population Density
2,354 People per Square Mile

Land Use

Entire Basin Within Bellevue
Public Right of Way 25.9% 25.9%
Commercial/Office 6.4% 6.4%
Industrial 0.5% 0.5%
Institutional/Government 3.6% 3.6%
Mixed Use/Misc 3.5% 3.5%
Multi-Family 1.4% 1.4%
Open Space/Park 24.7% 24.7%
Single Family Residential 28.6% 28.6%
Unknown 5.4% 5.4%

Land Cover

Entire Basin Within Bellevue
Impervious 33.5% 33.5%
Tree Canopy 43.2% 43.2%
Impervious in 100 Ft Stream Buffer 8.0% 8.0%
Tree Canopy in 100 Ft Stream Buffer 52.8% 52.8%
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