Diablo
Dam in Whatcom County, Washington · Skagit River · forms Diablo Reservoir
Height
389 ft
119 m (NID height)
Length
1,180 ft
360 m
Completed
1929
Diablo Reservoir today
1,202.18 ft
7 days ▲ 1.17 ft
Normal storage
50,000 acre-ft
Normal for the date
Reservoir level measured Oct 23, 2026, 10:00 AM PDT. Full level page →
Facts
- Purposes
- Hydroelectric; Fish and Wildlife Pond; Recreation; Flood Risk Reduction
- Dam type
- Concrete
- Structural height
- 389 ft
- Owner
- City of Seattle (Local Government)
- Maximum storage
- 89,200 acre-ft
- Surface area
- 770 acres
- Hydraulic height
- 335 ft
- Drainage area
- 1,160 sq mi
- Spillway
- Controlled
- Army Corps district
- Seattle District
- NID ID
- WA00170
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Aug 26, 2026. Search NID ID WA00170 at nid.sec.usace.army.mil. Project website.