US Bridges

Local Road over Silver Creek

Fair

Winneshiek County, Iowa · 099090101 · Structure no. 000000000348781

Built
1969
56 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
39
2022 count
Owner
County
County Highway Agency

About this bridge

Local Road over Silver Creek is a concrete continuous culvert carrying Local Road over Silver Creek in Winneshiek County, Iowa. It was built in 1969, so it is 56 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 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 39 vehicles a day, projected to reach 39 by 2044. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesLocal Road
CrossesSilver Creek
Location099090101
RouteCounty Highway 0
CountyWinneshiek County
StateIowa
Coordinates43.42859, -91.86494
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating38.6 US tons
Inventory rating23.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic39 (2022)
Projected traffic39 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Local Road over Silver Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is Local Road 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 March 2024.

How much traffic does Local Road over Silver Creek carry?

About 39 vehicles per day (2022 count).

How long is Local Road over Silver Creek?

The structure is 28 ft (8.5 m) long with a longest span of 14 ft (4.3 m).

Who owns Local Road over Silver Creek?

It is owned by the County Highway Agency.