US Bridges

FM over Drainage

PoorPosted for load

Webster County, Iowa · 088302004 · Structure no. 000000000342915

Built
1973
52 years old
Condition
Poor
inspected November 2023
Type
Slab
Concrete
Length
33 ft
1 main span
Daily traffic
628
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 1973, so it is 52 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 628 vehicles a day, roughly 34% of them trucks, projected to reach 628 by 2043. The structure is 33 ft (10.1 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesFM
CrossesDrainage
Location088302004
RouteCounty Highway 0
StateIowa
Coordinates42.41273, -94.37841
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating14.7 US tons
Inventory rating0 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic628 (2022)
Projected traffic628 by 2043
Trucks34%
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 1973, making it 52 years old in 2025.

What condition is FM over Drainage in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2023.

How much traffic does FM over Drainage carry?

About 628 vehicles per day (2022 count), of which roughly 34% 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 30 ft wide.

Who owns FM over Drainage?

It is owned by the County Highway Agency.