Mann Creek Dam
Dam in Washington County, Idaho · Mann Creek · forms Mann Creek Reservoir
Height
148 ft
45 m (NID height)
Length
1,176 ft
358 m
Completed
1967
Mann Creek Reservoir today
2,825.81 ft
7 days ▲ 0.13 ft
Reservoir level measured Oct 21, 2026, 12:00 AM MDT. Full level page →
Facts
- Purposes
- Irrigation
- Dam type
- Earth
- Structural height
- 148 ft
- Owner
- BUREAU OF RECLAMATION (Federal)
- Maximum storage
- 12,536 acre-ft
- Surface area
- 283 acres
- Hydraulic height
- 132 ft
- Drainage area
- 56 sq mi
- Spillway
- Uncontrolled, 69 ft wide
- Army Corps district
- Walla Walla District
- Also known as
- Mann Creek Reservoir;Spangler
- NID ID
- ID00285
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 6, 2026. Search NID ID ID00285 at nid.sec.usace.army.mil. Project website.