US Bridges

Ja Road over Carp River

Fair

Marquette County, Michigan · 1.5 MI N of US41 · Structure no. 000000000006597

Built
1934
91 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
37 ft
1 main span
Daily traffic
1,004
2001 count
Owner
County
County Highway Agency

About this bridge

Ja Road over Carp River is a steel stringer/multi-beam or girder carrying Ja Road over Carp River in Marquette County, Michigan. It was built in 1934, so it is 91 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 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 1,004 vehicles a day, projected to reach 1,025 by 2020. The structure is 37 ft (11.2 m) long and 22 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesJa Road
CrossesCarp River
Location1.5 MI N of US41
RouteCounty Highway 0
CountyMarquette County
StateMichigan
Coordinates46.53036, -87.60393
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating85.2 US tons
Inventory rating40.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length37 ft (11.2 m)
Longest span35 ft (10.6 m)
Deck width22 ft (6.6 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,004 (2001)
Projected traffic1,025 by 2020
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$68,000 (2050 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Ja Road over Carp River built?

It was built in 1934, making it 91 years old in 2025.

What condition is Ja Road over Carp River 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 2023.

How much traffic does Ja Road over Carp River carry?

About 1,004 vehicles per day (2001 count).

How long is Ja Road over Carp River?

The structure is 37 ft (11.2 m) long with a longest span of 35 ft (10.6 m) and a deck 22 ft wide.

Who owns Ja Road over Carp River?

It is owned by the County Highway Agency.