US Bridges

FM over Drainage

FairPosted for load

Butler County, Iowa · 090151102 · Structure no. 000000000086630

Built
1900
125 years old, rebuilt 1997
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
39 ft
2 main spans
Daily traffic
79
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Drainage is a wood or timber stringer/multi-beam or girder carrying FM over Drainage in Butler County, Iowa. It was built in 1900 and reconstructed in 1997, so it is 125 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for other load-capacity restriction.

It carries about 79 vehicles a day, projected to reach 79 by 2043. The structure is 39 ft (11.9 m) long and 18 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesFM
CrossesDrainage
Location090151102
RouteCounty Highway 0
CountyButler County
StateIowa
Coordinates42.61717, -92.59382
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating44.1 US tons
Inventory rating35.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span19 ft (5.8 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic79 (2022)
Projected traffic79 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$554,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Drainage built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1997.

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 April 2023.

How much traffic does FM over Drainage carry?

About 79 vehicles per day (2022 count).

How long is FM over Drainage?

The structure is 39 ft (11.9 m) long with a longest span of 19 ft (5.8 m) and a deck 18 ft wide.

Who owns FM over Drainage?

It is owned by the County Highway Agency.