Hiram M. Chittenden Locks and Dam
Dam in King County, Washington · Cedar River, Sammamish River · forms Lake Washington Ship Canal
Height
63 ft
19 m (NID height)
Length
240 ft
73 m
Completed
1916
Lake Washington Ship Canal today
20.54 ft
7 days ▲ 0.08 ft
Normal storage
458,000 acre-ft
Normal for the date
Reservoir level measured Oct 23, 2026, 10:00 AM PDT. Full level page →
Facts
- Purposes
- Navigation; Fish and Wildlife Pond; Recreation
- Dam type
- Gravity
- Structural height
- 63 ft
- Owner
- USACE - Seattle District (Federal)
- Maximum storage
- 458,000 acre-ft
- Surface area
- 25,000 acres
- Hydraulic height
- 25 ft
- Drainage area
- 607 sq mi
- Spillway
- Controlled, 192 ft wide
- Navigation locks
- 2
- Army Corps district
- Seattle District
- Also known as
- Lake Washington
- NID ID
- WA00301
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Jul 13, 2026. Search NID ID WA00301 at nid.sec.usace.army.mil. Project website.