US Bridges

Hogback Bridge RD over North River

Good

Madison County, Iowa · 076281406 · Structure no. 000000000363535

Built
1992
33 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
230 ft
3 main spans
Daily traffic
131
2022 count
Owner
County
County Highway Agency

About this bridge

Hogback Bridge RD over North River is a prestressed concrete stringer/multi-beam or girder carrying Hogback Bridge RD over North River in Madison County, Iowa. It was built in 1992, so it is 33 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 131 vehicles a day, projected to reach 131 by 2043. The structure is 230 ft (70.1 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesHogback Bridge RD
CrossesNorth River
Location076281406
RouteCounty Highway 0
StateIowa
Coordinates41.38576, -94.04804
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length230 ft (70.1 m)
Longest span82 ft (25 m)
Deck width27 ft (8.3 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic131 (2022)
Projected traffic131 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$30,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Hogback Bridge RD over North River built?

It was built in 1992, making it 33 years old in 2025.

What condition is Hogback Bridge RD over North 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 August 2023.

How much traffic does Hogback Bridge RD over North River carry?

About 131 vehicles per day (2022 count).

How long is Hogback Bridge RD over North River?

The structure is 230 ft (70.1 m) long with a longest span of 82 ft (25 m) and a deck 27 ft wide.

Who owns Hogback Bridge RD over North River?

It is owned by the County Highway Agency.