Welcome Lake Dam

Welcome Lake Dam is an earth dam located in King County, Washington, built in 1959. It carries a High hazard potential classification and has a fair condition assessment.

About Welcome Lake Dam

The primary purpose of Welcome Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake Of The Woods Homeowners Association (private). It impounds the Colin Creek near Redmond.

The dam stands 24 feet tall and stretches 165 feet across, creates a reservoir covering 17 acres, has a maximum storage capacity of 327 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1959, the structure is well into its service life at over 50 years old.

This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 09/07/2022.

Living Downstream

If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Washington dam safety program can provide more specific information about emergency planning for this structure.

Search for dams near your address to see all dams in your area with hazard classifications and safety data.

High HazardFair ConditionEmergency Action Plan: Yes

Location

StateWashington
CountyKing
Nearest CityRedmond
River/StreamColin Creek
Coordinates47.72453, -122.04825

Physical Characteristics

Dam TypeEarth
NID Height24 ft
Dam Length165 ft
Year Completed1959 (67 years old)

Storage & Hydraulics

NID Storage327 acre-ft
Max Storage327 acre-ft
Normal Storage155 acre-ft
Surface Area17 acres
Drainage Area2 sq mi
Max Discharge1,700 cfs

Ownership & Safety

PurposeRecreation
OwnerLake of the Woods Homeowners Association
Owner TypePrivate
Hazard ClassificationHigh
Condition AssessmentFair
Last Inspection09/07/2022
Emergency Action PlanYes

Identifiers

NID IDWA00194
Federal IDWA00194
More InfoState Dam Safety Program

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