41.64700000, -87.66600000
Fixed bridge
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
What Boaters Should Know
Chatham Street Highway Bridge on Calumet Sag Channelnear Blue Island, IL; closed clearance about 25.9 ft. Low Cal-Sag bridge.
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.
Opening / Contact Notes
- Opening Schedule
- Fixed.
- Operator / Contact
- Not verified
Navigation And Regulatory Notes
- Air Draft Notes
- Closed/air-draft clearance: 25.9 ft. Datum/reference: Low Operating Level / Flat Pool; NGVD 1929. Clearance band: Route-relevant
- 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.
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.