Deerfield Dam
Dam in Pennington County, South Dakota · Castle Creek · forms Deerfield Reservoir
Height
171 ft
52 m (NID height)
Length
825 ft
251 m
Completed
1947
Deerfield Reservoir today
5,901.92 ft
7 days ▼ 0.74 ft
Normal storage
15,655 acre-ft
Reservoir level measured Oct 21, 2026, 1:00 AM CDT. Full level page →
Facts
- Purposes
- Fish and Wildlife Pond; Irrigation; Water Supply
- Dam type
- Earth
- Structural height
- 171 ft
- Owner
- BUREAU OF RECLAMATION (Federal)
- Maximum storage
- 42,310 acre-ft
- Surface area
- 423 acres
- Hydraulic height
- 100 ft
- Drainage area
- 92 sq mi
- Spillway
- Uncontrolled, 120 ft wide
- Army Corps district
- Omaha District
- Also known as
- Deerfield Lake
- NID ID
- SD01138
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 6, 2026. Search NID ID SD01138 at nid.sec.usace.army.mil. Project website.