US Bridges

370 Avenue over E Nishnabotna River

Fair

Fremont County, Iowa · 069402908 · Structure no. 000000000025480

Built
1957
68 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
325 ft
3 main spans
Daily traffic
757
2022 count
Owner
County
County Highway Agency

About this bridge

370 Avenue over E Nishnabotna River is a steel continuous stringer/multi-beam or girder carrying 370 Avenue over E Nishnabotna River in Fremont County, Iowa. It was built in 1957, so it is 68 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 757 vehicles a day, roughly 10% of them trucks, projected to reach 757 by 2043. The structure is 325 ft (99.1 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
Carries370 Avenue
CrossesE Nishnabotna River
Location069402908
RouteCounty Highway 0
CountyFremont County
StateIowa
Coordinates40.74708, -95.47971
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.4 US tons
Inventory rating32.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length325 ft (99.1 m)
Longest span127 ft (38.7 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic757 (2022)
Projected traffic757 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 370 Avenue over E Nishnabotna River built?

It was built in 1957, making it 68 years old in 2025.

What condition is 370 Avenue over E Nishnabotna 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 April 2023.

How much traffic does 370 Avenue over E Nishnabotna River carry?

About 757 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is 370 Avenue over E Nishnabotna River?

The structure is 325 ft (99.1 m) long with a longest span of 127 ft (38.7 m) and a deck 28 ft wide.

Who owns 370 Avenue over E Nishnabotna River?

It is owned by the County Highway Agency.