US Bridges

FM over Raccoon River

PoorPosted for load

Sac County, Iowa · 087353504 · Structure no. 000000000299900

Built
1921
104 years old
Condition
Poor
inspected August 2024
Type
Truss - Thru
Steel
Length
184 ft
2 main spans
Daily traffic
45
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Raccoon River is a steel truss - thru carrying FM over Raccoon River in Sac County, Iowa. It was built in 1921, so it is 104 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 45 vehicles a day, projected to reach 45 by 2044. The structure is 184 ft (56.1 m) long and 18 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesFM
CrossesRaccoon River
Location087353504
RouteCounty Highway 0
StateIowa
Coordinates42.30101, -94.89218
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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating12 US tons
Inventory rating0 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length184 ft (56.1 m)
Longest span90 ft (27.4 m)
Deck width18 ft (5.4 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2022)
Projected traffic45 by 2044
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 statusPossibly eligible for the National Register; requires further investigation
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 Raccoon River built?

It was built in 1921, making it 104 years old in 2025.

What condition is FM over Raccoon 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 August 2024.

How much traffic does FM over Raccoon River carry?

About 45 vehicles per day (2022 count).

How long is FM over Raccoon River?

The structure is 184 ft (56.1 m) long with a longest span of 90 ft (27.4 m) and a deck 18 ft wide.

Who owns FM over Raccoon River?

It is owned by the County Highway Agency.