US Bridges

118th Avenue over Wapsipinicon River

Fair

Clinton County, Iowa · 082E11704 · Structure no. 000000000122940

Built
1963
62 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
646 ft
7 main spans
Daily traffic
350
2022 count
Owner
County
County Highway Agency

About this bridge

118th Avenue over Wapsipinicon River is a steel continuous stringer/multi-beam or girder carrying 118th Avenue over Wapsipinicon River in Clinton County, Iowa. It was built in 1963, so it is 62 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 350 vehicles a day, roughly 20% of them trucks, projected to reach 350 by 2045. The structure is 646 ft (196.9 m) long and 30 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
Carries118th Avenue
CrossesWapsipinicon River
Location082E11704
RouteCounty Highway 0
CountyClinton County
StateIowa
Coordinates41.90802, -90.86444
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.9 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length646 ft (196.9 m)
Longest span98 ft (29.9 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2022)
Projected traffic350 by 2045
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.8 million
NavigationNo navigation control on waterway

Frequently asked questions

When was 118th Avenue over Wapsipinicon River built?

It was built in 1963, making it 62 years old in 2025.

What condition is 118th Avenue over Wapsipinicon River 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 January 2025.

How much traffic does 118th Avenue over Wapsipinicon River carry?

About 350 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is 118th Avenue over Wapsipinicon River?

The structure is 646 ft (196.9 m) long with a longest span of 98 ft (29.9 m) and a deck 30 ft wide.

Who owns 118th Avenue over Wapsipinicon River?

It is owned by the County Highway Agency.