US Bridges

NB US 75 over Stream

Fair

Plymouth County, Iowa · 1.3 MI N of SR C60 · Structure no. 000000000039420

Built
1950
75 years old, rebuilt 2023
Condition
Fair
inspected March 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
7,000
2022 count
Owner
State
State Highway Agency

About this bridge

NB US 75 over Stream is a concrete continuous culvert carrying NB US 75 over Stream in Plymouth County, Iowa. It was built in 1950 and reconstructed in 2023, so it is 75 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 7,000 vehicles a day, roughly 19% of them trucks, projected to reach 7,000 by 2044. The structure is 25 ft (7.6 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNB US 75
CrossesStream
Location1.3 MI N of SR C60
RouteU.S. Route 75
CountyPlymouth County
StateIowa
Coordinates42.64595, -96.28668
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27 US tons
Inventory rating20 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width51 ft (15.5 m)
Roadway width49 ft (14.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,000 (2022)
Projected traffic7,000 by 2044
Trucks19%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 NB US 75 over Stream built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2023.

What condition is NB US 75 over Stream 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 2024.

How much traffic does NB US 75 over Stream carry?

About 7,000 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is NB US 75 over Stream?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 51 ft wide.

Who owns NB US 75 over Stream?

It is owned by the State Highway Agency.