FM over Drainage

Poor

Webster County, Iowa · 089282401 · Structure no. 000000000343265

Built: 1977; 48 years old
Condition: Poor; inspected November 2023
Type: Slab; Concrete
Length: 33 ft; 1 main span
Daily traffic: 1,795; 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 poor condition with a lowest component rating of 4 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.

It carries about 1,795 vehicles a day, roughly 4% of them trucks, projected to reach 1,795 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).

Location

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CarriesFM

CrossesDrainage

Location089282401

RouteCounty Highway 0

CountyWebster County

StateIowa

Coordinates42.51571, -94.09897

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.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	4 Poor	Advanced section loss, deterioration, spalling or scour.
Channel and channel protection	7 Good	Some minor problems.

Last inspectionNovember 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation4: Meets minimum tolerable limits to be left in place as is

Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating39.2 US tons

Inventory rating17.7 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 width32 ft (9.8 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,795 (2022)

Projected traffic1,795 by 2043

Trucks4%

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 proposedOther structural work, including hydraulic replacements

Estimated improvement cost—

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 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 1,795 vehicles per day (2022 count), of which roughly 4% 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.