Dam Safety Program
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.
