US Bridges

FM over S River

PoorPosted for load

Warren County, Iowa · 075240504 · Structure no. 000000000333820

Built
1949
76 years old
Condition
Poor
inspected September 2024
Type
Truss - Thru
Steel
Length
232 ft
1 main span
Daily traffic
807
2022 count
Owner
County
County Highway Agency

About this bridge

FM over S River is a steel truss - thru carrying FM over S River in Warren County, Iowa. It was built in 1949, so it is 76 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 4 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 807 vehicles a day, roughly 6% of them trucks, projected to reach 807 by 2044. The structure is 232 ft (70.7 m) long and 24 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesFM
CrossesS River
Location075240504
RouteCounty Highway 0
CountyWarren County
StateIowa
Coordinates41.32238, -93.64546
Functional classRural Major 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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26 US tons
Inventory rating15 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 15
Structure length232 ft (70.7 m)
Longest span160 ft (48.8 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deck13 ft (4 m)

Traffic and service

Average daily traffic807 (2022)
Projected traffic807 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over S River built?

It was built in 1949, making it 76 years old in 2025.

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 807 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is FM over S River?

The structure is 232 ft (70.7 m) long with a longest span of 160 ft (48.8 m) and a deck 24 ft wide.

Who owns FM over S River?

It is owned by the County Highway Agency.