US Bridges

FM over N Skunk River

Fair

Marshall County, Iowa · 082201009 · Structure no. 000000000242190

Built
1956
69 years old, rebuilt 1990
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
105 ft
3 main spans
Daily traffic
413
2022 count
Owner
County
County Highway Agency

About this bridge

FM over N Skunk River is a prestressed concrete stringer/multi-beam or girder carrying FM over N Skunk River in Marshall County, Iowa. It was built in 1956 and reconstructed in 1990, so it is 69 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.

It carries about 413 vehicles a day, roughly 10% of them trucks, projected to reach 413 by 2044. The structure is 105 ft (32 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesFM
CrossesN Skunk River
Location082201009
RouteCounty Highway 0
StateIowa
Coordinates41.9279, -93.15583
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating64.4 US tons
Inventory rating20.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length105 ft (32 m)
Longest span43 ft (13.1 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic413 (2022)
Projected traffic413 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over N Skunk River built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1990.

What condition is FM over N Skunk River 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 November 2024.

How much traffic does FM over N Skunk River carry?

About 413 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is FM over N Skunk River?

The structure is 105 ft (32 m) long with a longest span of 43 ft (13.1 m) and a deck 33 ft wide.

Who owns FM over N Skunk River?

It is owned by the County Highway Agency.