US Bridges

10th ST over Branch Upper Iowa River

Fair

Howard County, Iowa · 100120703 · Structure no. 000000000366850

Built
1988
37 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
51
2022 count
Owner
County
County Highway Agency

About this bridge

10th ST over Branch Upper Iowa River is a concrete culvert carrying 10th ST over Branch Upper Iowa River in Howard County, Iowa. It was built in 1988, so it is 37 years old, younger 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 51 vehicles a day, projected to reach 51 by 2043. The structure is 25 ft (7.7 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries10th ST
CrossesBranch Upper Iowa River
Location100120703
RouteCounty Highway 0
CountyHoward County
StateIowa
Coordinates43.50057, -92.30123
Functional classRural Local

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 inspectionJune 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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33 US tons
Inventory rating22 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.7 m)
Longest span10 ft (2.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic51 (2022)
Projected traffic51 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byOther Local Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 10th ST over Branch Upper Iowa River built?

It was built in 1988, making it 37 years old in 2025.

What condition is 10th ST over Branch Upper Iowa 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 10th ST over Branch Upper Iowa River carry?

About 51 vehicles per day (2022 count).

How long is 10th ST over Branch Upper Iowa River?

The structure is 25 ft (7.7 m) long with a longest span of 10 ft (2.9 m).

Who owns 10th ST over Branch Upper Iowa River?

It is owned by the County Highway Agency and maintained by the Other Local Agency.