US Bridges

I-94 WB over M-25 Conn

Poor

St. Clair County, Michigan · In Port Huron over M-25 · Structure no. 000000000010019

Built
1964
61 years old, rebuilt 1982
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
270 ft
3 main spans
Daily traffic
21,619
2007 count
Owner
State
State Highway Agency

About this bridge

I-94 WB over M-25 Conn is a steel stringer/multi-beam or girder carrying I-94 WB over M-25 Conn in St. Clair County, Michigan. It was built in 1964 and reconstructed in 1982, so it is 61 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 21,619 vehicles a day, roughly 14% of them trucks, projected to reach 24,478 by 2015. The structure is 270 ft (82.3 m) long and 25 ft wide.

CarriesI-94 WB
CrossesM-25 Conn
LocationIn Port Huron over M-25
RouteInterstate 94
Coordinates42.99797, -82.44119
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating75.7 US tons
Inventory rating45.3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length270 ft (82.3 m)
Longest span114 ft (34.7 m)
Deck width25 ft (7.7 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,619 (2007)
Projected traffic24,478 by 2015
Trucks14%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-94 WB over M-25 Conn built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1982.

What condition is I-94 WB over M-25 Conn in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does I-94 WB over M-25 Conn carry?

About 21,619 vehicles per day (2007 count), of which roughly 14% are trucks.

How long is I-94 WB over M-25 Conn?

The structure is 270 ft (82.3 m) long with a longest span of 114 ft (34.7 m) and a deck 25 ft wide.

Who owns I-94 WB over M-25 Conn?

It is owned by the State Highway Agency.