Mason Dam
Dam in Baker County, Oregon · Powder River · forms Mason Reservoir
Height
173 ft
53 m (NID height)
Length
895 ft
273 m
Completed
1968
Mason Reservoir today
3,982.80 ft
7 days ▼ 0.51 ft
vs full pool
▼ 79.57 ft
Normal storage
78,500 acre-ft
Much below normal for the date
Reservoir level measured Oct 23, 2026, 1:00 AM PDT. Full level page →
Facts
- Purposes
- Flood Risk Reduction; Irrigation
- Dam type
- Rockfill
- Structural height
- 173 ft
- Owner
- BUREAU OF RECLAMATION (Federal)
- Maximum storage
- 95,500 acre-ft
- Surface area
- 2,235 acres
- Hydraulic height
- 153 ft
- Drainage area
- 165 sq mi
- Spillway
- Uncontrolled
- Army Corps district
- Portland District
- Also known as
- Mason Reservoir
- NID ID
- OR00577
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 22, 2025. Search NID ID OR00577 at nid.sec.usace.army.mil. Project website.