US Bridges

Lcl-Jahnke Ave over Silver Creek

PoorClosed to traffic

Mills County, Iowa · 072411903 · Structure no. 000000000245870

Built
1938
87 years old, rebuilt 1973
Condition
Poor
inspected March 2023
Type
Truss - Thru
Steel
Length
143 ft
1 main span
Daily traffic
5
2021 count
Owner
County
County Highway Agency

About this bridge

Lcl-Jahnke Ave over Silver Creek is a steel truss - thru carrying Lcl-Jahnke Ave over Silver Creek in Mills County, Iowa. It was built in 1938 and reconstructed in 1973, so it is 87 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 0 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: closed to all traffic.

It carries about 5 vehicles a day, projected to reach 5 by 2043. The structure is 143 ft (43.6 m) long and 17 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesLcl-Jahnke Ave
CrossesSilver Creek
Location072411903
RouteCounty Highway 0
CountyMills County
StateIowa
Coordinates41.0234, -95.60772
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck0 FailedOut of service and beyond corrective action.
Superstructure0 FailedOut of service and beyond corrective action.
Substructure0 FailedOut of service and beyond corrective action.
Channel and channel protection0 FailedOut of service and beyond corrective action.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour above top of footing
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+3 approach)
Design loadHS 20
Structure length143 ft (43.6 m)
Longest span90 ft (27.4 m)
Deck width17 ft (5.1 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2021)
Projected traffic5 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lcl-Jahnke Ave over Silver Creek built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1973.

What condition is Lcl-Jahnke Ave over Silver Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does Lcl-Jahnke Ave over Silver Creek carry?

About 5 vehicles per day (2021 count).

How long is Lcl-Jahnke Ave over Silver Creek?

The structure is 143 ft (43.6 m) long with a longest span of 90 ft (27.4 m) and a deck 17 ft wide.

Who owns Lcl-Jahnke Ave over Silver Creek?

It is owned by the County Highway Agency.