Jerry F. Costello Lock and Dam
Dam in Randolph County, Illinois · Kaskaskia River · forms Nav Project
Height
81 ft
25 m (NID height)
Length
603 ft
184 m
Completed
1974
Nav Project today
368.33 ft
7 days ▼ 0.04 ft
vs full pool
▼ 0.47 ft
Normal storage
22,183 acre-ft
Normal for the date
Reservoir level measured Oct 23, 2026, 2:00 PM CDT. Full level page →
Facts
- Purposes
- Navigation; Fish and Wildlife Pond; Recreation
- Dam type
- Concrete
- Structural height
- 81 ft
- Owner
- USACE - St. Louis District (Federal)
- Maximum storage
- 25,246 acre-ft
- Surface area
- 2,618 acres
- Hydraulic height
- 53 ft
- Drainage area
- 5,790 sq mi
- Spillway
- Controlled, 120 ft wide
- Navigation locks
- 1
- Army Corps district
- St. Louis District
- Also known as
- Kaskaskia Lock and Dam
- NID ID
- IL00115
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Aug 26, 2026. Search NID ID IL00115 at nid.sec.usace.army.mil. Project website.