US Bridges

FM over Drainage

Fair

Webster County, Iowa · 089271802 · Structure no. 000000000343055

Built
1977
48 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete
Length
33 ft
1 main span
Daily traffic
359
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Drainage is a concrete slab carrying FM over Drainage in Webster County, Iowa. It was built in 1977, so it is 48 years old, older 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 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 359 vehicles a day, roughly 35% of them trucks, projected to reach 359 by 2043. The structure is 33 ft (10.1 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesFM
CrossesDrainage
Location089271802
RouteCounty Highway 0
StateIowa
Coordinates42.52315, -94.08991
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating66.1 US tons
Inventory rating36.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic359 (2022)
Projected traffic359 by 2043
Trucks35%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$545,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Drainage built?

It was built in 1977, making it 48 years old in 2025.

What condition is FM over Drainage 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 November 2023.

How much traffic does FM over Drainage carry?

About 359 vehicles per day (2022 count), of which roughly 35% are trucks.

How long is FM over Drainage?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns FM over Drainage?

It is owned by the County Highway Agency.