US Bridges

Union Road over Union and State Line DR

Fair

Cass County, Michigan · 1.2 MI S of Union · Structure no. 000000000001449

Built
1983
42 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
310
2019 count
Owner
County
County Highway Agency

About this bridge

Union Road over Union and State Line DR is a prestressed concrete box beam or girders - multiple carrying Union Road over Union and State Line DR in Cass County, Michigan. It was built in 1983, so it is 42 years old, younger 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 6 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 310 vehicles a day, projected to reach 380 by 2039. The structure is 24 ft (7.3 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUnion Road
CrossesUnion and State Line DR
Location1.2 MI S of Union
RouteCounty Highway 1475
CountyCass County
StateMichigan
Coordinates41.77289, -85.87215
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.7 US tons
Inventory rating39.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic310 (2019)
Projected traffic380 by 2039
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Union Road over Union and State Line DR built?

It was built in 1983, making it 42 years old in 2025.

What condition is Union Road over Union and State Line DR 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 October 2024.

How much traffic does Union Road over Union and State Line DR carry?

About 310 vehicles per day (2019 count).

How long is Union Road over Union and State Line DR?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 28 ft wide.

Who owns Union Road over Union and State Line DR?

It is owned by the County Highway Agency.