US Bridges

350th Street over Silver Creek

Fair

Pottawattamie County, Iowa · 076412402 · Structure no. 000000000288471

Built
1996
29 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
98 ft
1 main span
Daily traffic
5
2022 count
Owner
County
County Highway Agency

About this bridge

350th Street over Silver Creek is a steel stringer/multi-beam or girder carrying 350th Street over Silver Creek in Pottawattamie County, Iowa. It was built in 1996, so it is 29 years old, younger 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 6 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 5 vehicles a day, projected to reach 5 by 2043. The structure is 98 ft (29.9 m) long and 18 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries350th Street
CrossesSilver Creek
Location076412402
RouteCounty Highway 0
StateIowa
Coordinates41.37227, -95.5173
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.5 US tons
Inventory rating24.3 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadHS 20
Structure length98 ft (29.9 m)
Longest span59 ft (18 m)
Deck width18 ft (5.4 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2022)
Projected traffic5 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 350th Street over Silver Creek built?

It was built in 1996, making it 29 years old in 2025.

What condition is 350th Street over Silver Creek 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 April 2024.

How much traffic does 350th Street over Silver Creek carry?

About 5 vehicles per day (2022 count).

How long is 350th Street over Silver Creek?

The structure is 98 ft (29.9 m) long with a longest span of 59 ft (18 m) and a deck 18 ft wide.

Who owns 350th Street over Silver Creek?

It is owned by the County Highway Agency.