Marseilles Lock and Dam
Dam in LaSalle County, Illinois · Illinois River · forms Marseilles Pool
Height
58 ft
18 m (NID height)
Length
2,078 ft
633 m
Completed
1933
Marseilles Pool today
483.15 ft
7 days ▼ 0.03 ft
Normal for the date
Reservoir level measured Oct 23, 2026, 8:00 AM CDT. Full level page →
Facts
- Purposes
- Navigation
- Dam type
- Concrete
- Structural height
- 58 ft
- Owner
- USACE - Rock Island District (Federal)
- Maximum storage
- 14,000 acre-ft
- Hydraulic height
- 27 ft
- Drainage area
- 8,259 sq mi
- Spillway
- None
- Navigation locks
- 1
- Army Corps district
- Rock Island District
- Also known as
- Marseilles Pool
- NID ID
- IL00003
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 16, 2026. Search NID ID IL00003 at nid.sec.usace.army.mil. Project website.