US Bridges

17 1/2 Mile Road over I-94

Fair

Calhoun County, Michigan · 2.4 MI E of I-69 · Structure no. 000000000001276

Built
1960
65 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete Continuous
Length
313 ft
4 main spans
Daily traffic
840
1974 count
Owner
State
State Highway Agency

About this bridge

17 1/2 Mile Road over I-94 is a concrete continuous tee beam carrying 17 1/2 Mile Road over I-94 in Calhoun County, Michigan. It was built in 1960, so it is 65 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 840 vehicles a day, roughly 1% of them trucks, projected to reach 43,800 by 2024. The structure is 313 ft (95.3 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries17 1/2 Mile Road
CrossesI-94
Location2.4 MI E of I-69
RouteCounty Highway 0
CountyCalhoun County
StateMichigan
Coordinates42.28796, -84.95457
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.1 US tons
Inventory rating42.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length313 ft (95.3 m)
Longest span93 ft (28.3 m)
Deck width33 ft (10.2 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic840 (1974)
Projected traffic43,800 by 2024
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 17 1/2 Mile Road over I-94 built?

It was built in 1960, making it 65 years old in 2025.

What condition is 17 1/2 Mile Road over I-94 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does 17 1/2 Mile Road over I-94 carry?

About 840 vehicles per day (1974 count), of which roughly 1% are trucks.

How long is 17 1/2 Mile Road over I-94?

The structure is 313 ft (95.3 m) long with a longest span of 93 ft (28.3 m) and a deck 33 ft wide.

Who owns 17 1/2 Mile Road over I-94?

It is owned by the State Highway Agency.