US Bridges

285 ST over Middle Nodaway River

Good

Adair County, Iowa · 074320605 · Structure no. 000000000054981

Built
2000
25 years old
Condition
Good
inspected April 2024
Type
Slab
Concrete Continuous
Length
75 ft
3 main spans
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

285 ST over Middle Nodaway River is a concrete continuous slab carrying 285 ST over Middle Nodaway River in Adair County, Iowa. It was built in 2000, so it is 25 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 26 vehicles a day, projected to reach 26 by 2043. The structure is 75 ft (22.9 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries285 ST
CrossesMiddle Nodaway River
Location074320605
RouteCounty Highway 0
StateIowa
Coordinates41.23736, -94.57667
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating83.8 US tons
Inventory rating50.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span29 ft (8.8 m)
Deck width27 ft (8.3 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 285 ST over Middle Nodaway River built?

It was built in 2000, making it 25 years old in 2025.

What condition is 285 ST over Middle Nodaway 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 April 2024.

How much traffic does 285 ST over Middle Nodaway River carry?

About 26 vehicles per day (2022 count).

How long is 285 ST over Middle Nodaway River?

The structure is 75 ft (22.9 m) long with a longest span of 29 ft (8.8 m) and a deck 27 ft wide.

Who owns 285 ST over Middle Nodaway River?

It is owned by the County Highway Agency.