Haozous Engineering

Watershed Research

Beaver Lake Watershed

When starting a new project, the more you know about your site's watershed, the better you'll be able to deal with impacts. This is particularly true with a project such as a highway, which can cross several drainage areas.

We can assist your planning efforts by providing you with a summary of relevant and current watershed information. We investigated 8-12 sources of data to compile the watershed summary shown below for Beaver Lake Watershed.

In a succinct summary report, you will have information about the following items:

Watershed Statistics
Regulatory Issues
Resources
Resource Concerns
Hydrology
Geology
Fisheries Habitat

With these data, you will more effectively be able to plan your project and address offsite issues of concern.

**Beaver Lake Watershed Summary**
Watershed Statistics Location: King County,WA WRIA 8: Cedar-Sammamish Watershed Watershed Area (Acres): 1,200 Primary land uses: residential, forest Basin plan: Beaver Lake Management Plan (1993)	Regulatory Issues Instream flows established: None TMDLs established: None Section 303(d) waterbodies/pollutant: Beaver Lake/total phosphorus Laughing Jacobs Creek/fecal coliform
Resources Beaver Lake Long Lake Laughing Jacobs Creek Regional Wetland 20 Tributary resources: Regional Wetland 26, Laughing Jacobs Lake, Lake Sammamish	Resource Concerns Phosphorus loading to Beaver Lake and Lake Sammamish Erosion, sedimentation, and increased peak flow rates in Laughing Jacobs Creek Downstream roadway flooding
Hydrology Flow rates at Beaver Lake outlet: 2-year flow: 11 cfs 10-year flow: 22 cfs 100-year flow: 35 cfs Annual rainfall: 45 inches	Geology Dominant soil types: Glacial till (Alderwood series) Groundwater recharge: 15 inches/year Sole Source Aquifers: None
Fish Habitat Salmonids: Present in lower Laughing Jacobs Creek Fish passage barriers: cascades at RM 0.57 on Laughing Jacobs Creek

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