US Bridges

Ia 37 over Soldier River

Fair

Monona County, Iowa · 0.3 Mi. E of Ia 183 · Structure no. 000000000036690

Built
1952
73 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
243 ft
3 main spans
Daily traffic
620
2021 count
Owner
State
State Highway Agency

About this bridge

Ia 37 over Soldier River is a steel continuous stringer/multi-beam or girder carrying Ia 37 over Soldier River in Monona 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 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 620 vehicles a day, roughly 26% of them trucks, projected to reach 620 by 2043. The structure is 243 ft (74.1 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesIa 37
CrossesSoldier River
Location0.3 Mi. E of Ia 183
RouteState Highway 37
CountyMonona County
StateIowa
Coordinates41.98123, -95.77436
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating58.2 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length243 ft (74.1 m)
Longest span94 ft (28.7 m)
Deck width32 ft (9.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic620 (2021)
Projected traffic620 by 2043
Trucks26%
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 37 over Soldier River built?

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

What condition is Ia 37 over Soldier 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 June 2023.

How much traffic does Ia 37 over Soldier River carry?

About 620 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is Ia 37 over Soldier River?

The structure is 243 ft (74.1 m) long with a longest span of 94 ft (28.7 m) and a deck 32 ft wide.

Who owns Ia 37 over Soldier River?

It is owned by the State Highway Agency.