US Bridges

FM over Boyer River

Good

Crawford County, Iowa · 082400803 · Structure no. 000000000126931

Built
1994
31 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
246 ft
3 main spans
Daily traffic
249
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 1994, so it is 31 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 249 vehicles a day, roughly 22% of them trucks, projected to reach 249 by 2042. The structure is 246 ft (75 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesFM
CrossesBoyer River
Location082400803
RouteCounty Highway 0
StateIowa
Coordinates41.92402, -95.52829
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating99.8 US tons
Inventory rating38.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length246 ft (75 m)
Longest span82 ft (25 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic249 (2022)
Projected traffic249 by 2042
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 1994, making it 31 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 March 2023.

How much traffic does FM over Boyer River carry?

About 249 vehicles per day (2022 count), of which roughly 22% are trucks.

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 33 ft wide.

Who owns FM over Boyer River?

It is owned by the County Highway Agency.