US Bridges

FM over Drainage

Good

Mahaska County, Iowa · 075163204 · Structure no. 000000000364390

Built
2001
24 years old
Condition
Good
inspected December 2024
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
620
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Drainage is a concrete continuous culvert carrying FM over Drainage in Mahaska County, Iowa. It was built in 2001, so it is 24 years old, younger 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 620 vehicles a day, roughly 16% of them trucks, projected to reach 620 by 2044. The structure is 21 ft (6.4 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesFM
CrossesDrainage
Location075163204
RouteCounty Highway 0
StateIowa
Coordinates41.25538, -92.73683
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 48 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 alignment7: Better than present minimum criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic620 (2022)
Projected traffic620 by 2044
Trucks16%
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 2001, making it 24 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 December 2024.

How much traffic does FM over Drainage carry?

About 620 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is FM over Drainage?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 32 ft wide.

Who owns FM over Drainage?

It is owned by the County Highway Agency.