US Bridges

FM over Drainage Ditch

FairPosted for load

Winnebago County, Iowa · 099251702 · Structure no. 000000000345140

Built
1955
70 years old, rebuilt 1988
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
51 ft
3 main spans
Daily traffic
90
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Drainage Ditch is a wood or timber stringer/multi-beam or girder carrying FM over Drainage Ditch in Winnebago County, Iowa. It was built in 1955 and reconstructed in 1988, so it is 70 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 90 vehicles a day, projected to reach 90 by 2043. The structure is 51 ft (15.5 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFM
CrossesDrainage Ditch
Location099251702
RouteCounty Highway 0
CountyWinnebago County
StateIowa
Coordinates43.39581, -93.83322
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 protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 alignment7: Better than present minimum criteria
Operating rating40.3 US tons
Inventory rating28.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadUnknown
Structure length51 ft (15.5 m)
Longest span23 ft (7 m)
Deck width24 ft (7.4 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2022)
Projected traffic90 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$743,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Drainage Ditch built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1988.

What condition is FM over Drainage Ditch 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 March 2023.

How much traffic does FM over Drainage Ditch carry?

About 90 vehicles per day (2022 count).

How long is FM over Drainage Ditch?

The structure is 51 ft (15.5 m) long with a longest span of 23 ft (7 m) and a deck 24 ft wide.

Who owns FM over Drainage Ditch?

It is owned by the County Highway Agency.