US Bridges

280th ST over Skunk River

Good

Hamilton County, Iowa · 087240101 · Structure no. 000000000171241

Built
2020
5 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete
Length
35 ft
2 main spans
Daily traffic
34
2022 count
Owner
County
County Highway Agency

About this bridge

280th ST over Skunk River is a concrete culvert carrying 280th ST over Skunk River in Hamilton County, Iowa. It was built in 2020, so it is 5 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 34 vehicles a day, projected to reach 34 by 2043. The structure is 35 ft (10.7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries280th ST
CrossesSkunk River
Location087240101
RouteCounty Highway 0
CountyHamilton County
StateIowa
Coordinates42.38355, -93.59222
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating54.7 US tons
Inventory rating42.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length35 ft (10.7 m)
Longest span17 ft (5.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34 (2022)
Projected traffic34 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$282,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 280th ST over Skunk River built?

It was built in 2020, making it 5 years old in 2025.

What condition is 280th ST over Skunk 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 2023.

How much traffic does 280th ST over Skunk River carry?

About 34 vehicles per day (2022 count).

How long is 280th ST over Skunk River?

The structure is 35 ft (10.7 m) long with a longest span of 17 ft (5.2 m).

Who owns 280th ST over Skunk River?

It is owned by the County Highway Agency.