US Bridges

FM over Drainage

Good

Mahaska County, Iowa · 076162503 · Structure no. 000000000237521

Built
1989
36 years old
Condition
Good
inspected December 2023
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
80
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 1989, so it is 36 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 80 vehicles a day, projected to reach 80 by 2043. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 3.7 mi (6 km).

CarriesFM
CrossesDrainage
Location076162503
RouteCounty Highway 0
StateIowa
Coordinates41.36453, -92.64945
Functional classRural Minor 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 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 length25 ft (7.6 m)
Longest span22 ft (6.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2022)
Projected traffic80 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 1989, making it 36 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 2023.

How much traffic does FM over Drainage carry?

About 80 vehicles per day (2022 count).

How long is FM over Drainage?

The structure is 25 ft (7.6 m) long with a longest span of 22 ft (6.7 m).

Who owns FM over Drainage?

It is owned by the County Highway Agency.