US Bridges

FM over Drainage

Good

Plymouth County, Iowa · 090432904 · Structure no. 000000000270745

Built
1972
53 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete
Length
100 ft
3 main spans
Daily traffic
748
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Drainage is a concrete slab carrying FM over Drainage in Plymouth County, Iowa. It was built in 1972, so it is 53 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 748 vehicles a day, roughly 15% of them trucks, projected to reach 748 by 2044. The structure is 100 ft (30.5 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesFM
CrossesDrainage
Location090432904
RouteCounty Highway 0
StateIowa
Coordinates42.58274, -95.95753
Functional classRural Major Collector

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 inspectionAugust 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54.9 US tons
Inventory rating33.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span38 ft (11.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic748 (2022)
Projected traffic748 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Drainage built?

It was built in 1972, making it 53 years old in 2025.

What condition is FM over Drainage 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 August 2024.

How much traffic does FM over Drainage carry?

About 748 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is FM over Drainage?

The structure is 100 ft (30.5 m) long with a longest span of 38 ft (11.6 m) and a deck 32 ft wide.

Who owns FM over Drainage?

It is owned by the County Highway Agency.