US Bridges

Gibbon Ave over Middle River

Good

Adair County, Iowa · 0.2 MI S of CO Line · Structure no. 000000000058041

Built
2016
9 years old
Condition
Good
inspected July 2024
Type
Culvert
Concrete Continuous
Length
25 ft
1 main span
Daily traffic
15
2023 count
Owner
County
County Highway Agency

About this bridge

Gibbon Ave over Middle River is a concrete continuous culvert carrying Gibbon Ave over Middle River in Adair County, Iowa. It was built in 2016, so it is 9 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 15 vehicles a day, projected to reach 15 by 2043. The structure is 25 ft (7.6 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesGibbon Ave
CrossesMiddle River
Location0.2 MI S of CO Line
RouteCounty Highway 0
CountyAdair County
StateIowa
Coordinates41.50194, -94.58592
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.
Culvert7 GoodSome minor problems.
Last inspectionJuly 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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width26 ft (7.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2023)
Projected traffic15 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 byCounty 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 Gibbon Ave over Middle River built?

It was built in 2016, making it 9 years old in 2025.

What condition is Gibbon Ave over Middle 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 July 2024.

How much traffic does Gibbon Ave over Middle River carry?

About 15 vehicles per day (2023 count).

How long is Gibbon Ave over Middle River?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 26 ft wide.

Who owns Gibbon Ave over Middle River?

It is owned by the County Highway Agency.