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Diagram of an embankment dam showing labeled parts: reservoir, crest, abutment contact, upstream and downstream slopes, toe drain with outfall, outlet works, principal spillway, and emergency spillway.

Dam Safety Program

Public Works

Associate Stormwater Engineer

Jayden Abrams
(425) 295 0551

The City of Sammamish is the owner of eight earthen fill dams that are regulated by the Department of Ecology's Dam Safety Office:

Facility ID  Facility Name Hazard Class
D92477

Trossachs Pond

3
D92709

Trossachs Div. 8 PC-3 (North of Trossachs Blvd.)

2D
D92957

Trossachs Div. 8 - Pond PC-2 (Main Trossachs Dam)

1C
DR0609

Queens Bog Dam

3
DR0612

Klahanie 1 (Rainbow Lake on Issaquah Pine Lake Road (IPLR) and Klahanie Blvd)

2E
DR0613

Yellow Lake Dam

1B
DR0615

Klahanie 13

2
DS0133

Conner Jarvis Dam (Meadowleaf East)

2E

 

The dams regulated by the Department of Ecology in Sammamish:

  • Store at least 10 acre-feet (or 3.2 million gallons) of water
  • Are earthen-fill dams
  • Were built for stormwater detention

All dams are inspected by the City annually. They are also inspected and regulated by the Dam Safety Office (DSO) of the Washington State Department of Ecology (Ecology).

An important part of being a dam owner is to keep an Emergency Action Plan (EAP). They are updated regularly and can be provided upon request.

Map showing the locations of dams regulated by DSO in Sammamish, WA, with labeled sites including Trossachs and Klahanie, major roads, parks, and ponds marked.