US Bridges

FM-310th Street over Little Silver Creek

Good

Pottawattamie County, Iowa · 075410502 · Structure no. 000000000286071

Built
1979
46 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
97 ft
3 main spans
Daily traffic
89
2022 count
Owner
County
County Highway Agency

About this bridge

FM-310th Street over Little Silver Creek is a prestressed concrete stringer/multi-beam or girder carrying FM-310th Street over Little Silver Creek in Pottawattamie County, Iowa. It was built in 1979, so it is 46 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 89 vehicles a day, projected to reach 89 by 2043. The structure is 97 ft (29.6 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesFM-310th Street
CrossesLittle Silver Creek
Location075410502
RouteCounty Highway 0
StateIowa
Coordinates41.33079, -95.59402
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.2 US tons
Inventory rating66.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length97 ft (29.6 m)
Longest span32 ft (9.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic89 (2022)
Projected traffic89 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM-310th Street over Little Silver Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is FM-310th Street over Little Silver Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does FM-310th Street over Little Silver Creek carry?

About 89 vehicles per day (2022 count).

How long is FM-310th Street over Little Silver Creek?

The structure is 97 ft (29.6 m) long with a longest span of 32 ft (9.8 m) and a deck 32 ft wide.

Who owns FM-310th Street over Little Silver Creek?

It is owned by the County Highway Agency.