41.65500000, -88.01100000
Fixed bridgeRailroad bridge
WaterwayIllinois Waterway / Chicago Sanitary & Ship Canal
Route SegmentRoute-wide
Route VariantAll
State / ProvinceIL
Nearest CityLemont / Chicago area
Mile MarkerMM 300.5 / 300.6
Bridge TypeFixed/swing railroad bridge (does not open)
Source Confidencemedium
What Boaters Should Know
Great Loop lowest unavoidable fixed bridge on Illinois Waterway / Chicago Sanitary & Ship Canalnear Lemont / Chicago area, IL; closed clearance about 19.7 ft. Lowest unavoidable Great Loop air-draft control point.
Clearance And Opening Details
Vertical Clearance Closed19.70 ft
Vertical Clearance OpenNot verified
Horizontal Clearance160.00 ft
VHF ChannelNot verified
PhoneNot verified
Last Verified2026-06-08
Verify against current water level / bridge gauge before transit.
Opening / Contact Notes
- Opening Schedule
- Does not open
- Operator / Contact
- Not verified
Navigation And Regulatory Notes
- Air Draft Notes
- Closed/air-draft clearance: 19.7 ft. Datum/reference: USACE low operating level / flat pool; AGLCA charted value. Clearance band: Route-limiting / Critical
- Navigation Notes
- Does not open AGLCA identifies this as the lowest fixed bridge with no alternate route. Any full-loop vessel must clear this bridge or lower gear. Closed/air-draft clearance: 19.7 ft. Datum/reference: USACE low operating level / flat pool; AGLCA charted value. Clearance band: Route-limiting / Critical Does not open
- Regulatory Notes
- Does not open AGLCA identifies this as the lowest fixed bridge with no alternate route. Any full-loop vessel must clear this bridge or lower gear.
Planning Considerations
Confirm your vessel air draft, current water levels, bridge signage, official charts, bridge schedules, Local Notices to Mariners, and any VHF or phone procedures before approaching this bridge. If the bridge is movable, build extra time into your route plan for opening windows, traffic, restrictions, weather, and communication delays.