US Bridges

US 6 over Silver Creek

Fair

Pottawattamie County, Iowa · 1.0 Mi. E of SR L66 · Structure no. 000000000043270

Built
1961
64 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
245 ft
3 main spans
Daily traffic
2,820
2022 count
Owner
State
State Highway Agency

About this bridge

US 6 over Silver Creek is a steel continuous stringer/multi-beam or girder carrying US 6 over Silver Creek in Pottawattamie County, Iowa. It was built in 1961, so it is 64 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 2,820 vehicles a day, roughly 15% of them trucks, projected to reach 2,820 by 2044. The structure is 245 ft (74.7 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesUS 6
CrossesSilver Creek
Location1.0 Mi. E of SR L66
RouteU.S. Route 6
StateIowa
Coordinates41.28937, -95.51751
Functional classRural Minor Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.3 US tons
Inventory rating33.5 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length245 ft (74.7 m)
Longest span93 ft (28.3 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,820 (2022)
Projected traffic2,820 by 2044
Trucks15%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 6 over Silver Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is US 6 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 June 2024.

How much traffic does US 6 over Silver Creek carry?

About 2,820 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is US 6 over Silver Creek?

The structure is 245 ft (74.7 m) long with a longest span of 93 ft (28.3 m) and a deck 36 ft wide.

Who owns US 6 over Silver Creek?

It is owned by the State Highway Agency.