Great Loop bridge planning reference

Chatham Street Highway Bridge

Chatham Street Highway Bridge on Calumet Sag Channelnear Blue Island, IL; closed clearance about 25.9 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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41.64700000, -87.66600000

Planning only Fixed bridgeAir draft concern
WaterwayCalumet Sag Channel
Route SegmentIllinois / Chicago
Route VariantInland Rivers / Chicago or Cal-Sag
State / ProvinceIL
Nearest CityBlue Island
Mile MarkerRM 318.2
Bridge TypeFixed
Source Confidencemedium

Clearance And Opening Details

Vertical Clearance Closed25.90 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: 25.9 ft. Datum/reference: Low Operating Level / Flat Pool; NGVD 1929. Clearance band: Route-relevant
Opening Schedule
Fixed.
Operator / Contact
Not verified
Navigation Notes
Fixed. Tight for 25-ft air-draft vessels depending on water level. Closed/air-draft clearance: 25.9 ft. Datum/reference: Low Operating Level / Flat Pool; NGVD 1929. Clearance band: Route-relevant Fixed.
Regulatory Notes
Fixed. Tight for 25-ft air-draft vessels depending on water level.