Michael J. Kirwan Dam
Dam in Portage County, Ohio · West Branch of The Mahoning · forms Michael J Kirwan Reservoir
Height
83 ft
25 m (NID height)
Length
9,900 ft
3,018 m
Completed
1966
Michael J Kirwan Reservoir today
980.80 ft
7 days ▼ 0.26 ft
vs full pool
▲ 0.24 ft
Normal storage
56,700 acre-ft
Normal for the date
Reservoir level measured Oct 23, 2026, 2:00 PM EDT. Full level page →
Facts
- Purposes
- Flood Risk Reduction; Other
- Dam type
- Earth
- Structural height
- 83 ft
- Owner
- USACE - Pittsburgh District (Federal)
- Maximum storage
- 124,000 acre-ft
- Surface area
- 2,650 acres
- Hydraulic height
- 77 ft
- Drainage area
- 81 sq mi
- Spillway
- Uncontrolled, 300 ft wide
- Army Corps district
- Pittsburgh District
- Also known as
- Michael J Kirwan Reservoir
- NID ID
- OH00030
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Sep 16, 2026. Search NID ID OH00030 at nid.sec.usace.army.mil. Project website.