US Bridges

FM over Boyer River

Good

Crawford County, Iowa · 083391609 · Structure no. 000000000127815

Built
1975
50 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
246 ft
3 main spans
Daily traffic
131
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Boyer River is a prestressed concrete stringer/multi-beam or girder carrying FM over Boyer River in Crawford County, Iowa. It was built in 1975, so it is 50 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 131 vehicles a day, projected to reach 131 by 2043. The structure is 246 ft (75 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesFM
CrossesBoyer River
Location083391609
RouteCounty Highway 0
StateIowa
Coordinates42.00232, -95.38582
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating85.1 US tons
Inventory rating34 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length246 ft (75 m)
Longest span82 ft (25 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic131 (2022)
Projected traffic131 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 FM over Boyer River built?

It was built in 1975, making it 50 years old in 2025.

What condition is FM over Boyer River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does FM over Boyer River carry?

About 131 vehicles per day (2022 count).

How long is FM over Boyer River?

The structure is 246 ft (75 m) long with a longest span of 82 ft (25 m) and a deck 32 ft wide.

Who owns FM over Boyer River?

It is owned by the County Highway Agency.