US Bridges

FM over S River

PoorPosted for load

Warren County, Iowa · 075251304 · Structure no. 000000000333960

Built
1940
85 years old, rebuilt 1954
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
79 ft
1 main span
Daily traffic
71
2022 count
Owner
County
County Highway Agency

About this bridge

FM over S River is a steel stringer/multi-beam or girder carrying FM over S River in Warren County, Iowa. It was built in 1940 and reconstructed in 1954, so it is 85 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 3 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. Its operating status is: posted for load restriction.

It carries about 71 vehicles a day, projected to reach 71 by 2044. The structure is 79 ft (24.1 m) long and 21 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesFM
CrossesS River
Location075251304
RouteCounty Highway 0
StateIowa
Coordinates41.30553, -93.68301
Functional classRural Minor 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.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating7.4 US tons
Inventory rating4 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadUnknown
Structure length79 ft (24.1 m)
Longest span39 ft (11.9 m)
Deck width21 ft (6.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71 (2022)
Projected traffic71 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$871,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over S River built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1954.

What condition is FM over S River 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 September 2024.

How much traffic does FM over S River carry?

About 71 vehicles per day (2022 count).

How long is FM over S River?

The structure is 79 ft (24.1 m) long with a longest span of 39 ft (11.9 m) and a deck 21 ft wide.

Who owns FM over S River?

It is owned by the County Highway Agency.