US Bridges

280th ST over Branch Iowa River

Good

Tama County, Iowa · 083150401 · Structure no. 000000000318011

Built
2017
8 years old
Condition
Good
inspected September 2020
Type
Slab
Concrete Continuous
Length
133 ft
3 main spans
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

280th ST over Branch Iowa River is a concrete continuous slab carrying 280th ST over Branch Iowa River in Tama County, Iowa. It was built in 2017, so it is 8 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15 vehicles a day, projected to reach 15 by 2043. The structure is 133 ft (40.5 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries280th ST
CrossesBranch Iowa River
Location083150401
RouteCounty Highway 0
CountyTama County
StateIowa
Coordinates42.0358, -92.60399
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2020
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length133 ft (40.5 m)
Longest span51 ft (15.5 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2022)
Projected traffic15 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 280th ST over Branch Iowa River built?

It was built in 2017, making it 8 years old in 2025.

What condition is 280th ST over Branch Iowa River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2020.

How much traffic does 280th ST over Branch Iowa River carry?

About 15 vehicles per day (2022 count).

How long is 280th ST over Branch Iowa River?

The structure is 133 ft (40.5 m) long with a longest span of 51 ft (15.5 m) and a deck 33 ft wide.

Who owns 280th ST over Branch Iowa River?

It is owned by the County Highway Agency.