Mud Mountain Dam
Dam in King County, Washington · White River · forms Mud Mountain Lake
Height
425 ft
130 m (NID height)
Length
700 ft
213 m
Completed
1948
Mud Mountain Lake today
915.93 ft
7 days ▼ 0.29 ft
Normal for the date
Reservoir level measured Oct 23, 2026, 11:00 AM PDT. Full level page →
Facts
- Purposes
- Flood Risk Reduction; Recreation
- Dam type
- Rockfill
- Structural height
- 425 ft
- Owner
- USACE - Seattle District (Federal)
- Maximum storage
- 106,000 acre-ft
- Surface area
- 1 acres
- Hydraulic height
- 350 ft
- Drainage area
- 400 sq mi
- Spillway
- Uncontrolled, 315 ft wide
- Army Corps district
- Seattle District
- Also known as
- Mud Mountain Lake
- NID ID
- WA00300
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Jul 30, 2026. Search NID ID WA00300 at nid.sec.usace.army.mil. Project website.