US Bridges

FM over Maple River

Fair

Woodbury County, Iowa · 086422708 · Structure no. 000000000350251

Built
1985
40 years old
Condition
Fair
inspected June 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
324 ft
3 main spans
Daily traffic
429
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Maple River is a steel continuous girder and floorbeam system carrying FM over Maple River in Woodbury County, Iowa. It was built in 1985, so it is 40 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 429 vehicles a day, roughly 23% of them trucks, projected to reach 429 by 2043. The structure is 324 ft (98.8 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFM
CrossesMaple River
Location086422708
RouteCounty Highway 0
CountyWoodbury County
StateIowa
Coordinates42.22689, -95.71943
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating68.1 US tons
Inventory rating40.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length324 ft (98.8 m)
Longest span124 ft (37.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic429 (2022)
Projected traffic429 by 2043
Trucks23%
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.6 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Maple River built?

It was built in 1985, making it 40 years old in 2025.

What condition is FM over Maple 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 June 2023.

How much traffic does FM over Maple River carry?

About 429 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is FM over Maple River?

The structure is 324 ft (98.8 m) long with a longest span of 124 ft (37.8 m) and a deck 32 ft wide.

Who owns FM over Maple River?

It is owned by the County Highway Agency.