Great Loop bridge planning reference

Gulf Mobile & Ohio Railroad Bridge

Gulf Mobile & Ohio Railroad Bridge on Calumet Sag Channelnear Lemont / Alsip area, IL; closed clearance about 24.6 ft. Low Cal-Sag bridge.

Planning awareness only: Bridge information is provided for planning awareness only. Always verify current bridge status, clearance, water levels, bridge schedules, opening restrictions, Local Notices to Mariners, bridge signage, and official charts before transit. FloatPlanWizard is not a navigation authority.

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41.66500000, -87.95000000

Planning only Fixed bridgeRailroad bridgeAir draft concern
WaterwayCalumet Sag Channel
Route SegmentIllinois / Chicago
Route VariantInland Rivers / Chicago or Cal-Sag
State / ProvinceIL
Nearest CityLemont / Alsip area
Mile MarkerRM 303.9
Bridge TypeFixed railroad
Source Confidencemedium

Clearance And Opening Details

Vertical Clearance Closed24.60 ft
Vertical Clearance OpenNot verified
Horizontal Clearance225.00 ft
VHF ChannelNot verified
PhoneNot verified
Last Verified2026-06-08
Verify against current water level / bridge gauge before transit.

Planning Notes

Air Draft Notes
Closed/air-draft clearance: 24.6 ft. Datum/reference: Low Operating Level / Flat Pool; NGVD 1929. Clearance band: Low / Timing-sensitive
Opening Schedule
Fixed.
Operator / Contact
Not verified
Navigation Notes
Fixed. Important alternate route clearance. Closed/air-draft clearance: 24.6 ft. Datum/reference: Low Operating Level / Flat Pool; NGVD 1929. Clearance band: Low / Timing-sensitive Fixed.
Regulatory Notes
Fixed. Important alternate route clearance.