Upper Stillwater Dam
Dam in Duchesne County, Utah · Rock Creek · forms Upper Stillwater Reservoir
Height
292 ft
89 m (NID height)
Length
2,660 ft
811 m
Completed
1987
Upper Stillwater Reservoir today
8,116.24 ft
7 days –
Normal storage
33,123 acre-ft
Reservoir level measured Oct 20, 2026, 1:00 AM MDT. Full level page →
Facts
- Purposes
- Irrigation; Recreation; Water Supply
- Dam type
- Concrete
- Structural height
- 292 ft
- Owner
- DEPARTMENT OF THE INTERIOR (Federal)
- Maximum storage
- 35,253 acre-ft
- Surface area
- 329 acres
- Hydraulic height
- 195 ft
- Drainage area
- 99 sq mi
- Spillway
- Uncontrolled, 600 ft wide
- Army Corps district
- Omaha District
- Also known as
- Upper Stillwater Reservoir
- NID ID
- UT00608
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 22, 2025. Search NID ID UT00608 at nid.sec.usace.army.mil. Project website.