US Bridges

Main ST over Wapsipinicon River

Fair

Linn County, Iowa · 000000000 · Structure no. 000000000001670

Built
1952
73 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
323 ft
3 main spans
Daily traffic
3,187
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main ST over Wapsipinicon River is a steel continuous stringer/multi-beam or girder carrying Main ST over Wapsipinicon River in Linn County, Iowa. It was built in 1952, so it is 73 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 3,187 vehicles a day, projected to reach 3,187 by 2043. The structure is 323 ft (98.5 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMain ST
CrossesWapsipinicon River
Location000000000
RouteCity Street 0
CountyLinn County
StateIowa
Coordinates42.20346, -91.52775
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length323 ft (98.5 m)
Longest span125 ft (38.1 m)
Deck width35 ft (10.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,187 (2021)
Projected traffic3,187 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Main ST over Wapsipinicon River built?

It was built in 1952, making it 73 years old in 2025.

What condition is Main ST 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 March 2023.

How much traffic does Main ST over Wapsipinicon River carry?

About 3,187 vehicles per day (2021 count).

How long is Main ST over Wapsipinicon River?

The structure is 323 ft (98.5 m) long with a longest span of 125 ft (38.1 m) and a deck 35 ft wide.

Who owns Main ST over Wapsipinicon River?

It is owned by the City or Municipal Highway Agency.