US Bridges

Tri-County Br over Iowa River

Good

Louisa County, Iowa · 076050601 · Structure no. 000000000224785

Built
1980
45 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
701 ft
8 main spans
Daily traffic
80
2022 count
Owner
County
County Highway Agency

About this bridge

Tri-County Br over Iowa River is a prestressed concrete stringer/multi-beam or girder carrying Tri-County Br over Iowa River in Louisa County, Iowa. It was built in 1980, so it is 45 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 80 vehicles a day, projected to reach 80 by 2043. The structure is 701 ft (213.7 m) long and 32 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesTri-County Br
CrossesIowa River
Location076050601
RouteCounty Highway 0
StateIowa
Coordinates41.42388, -91.48076
Functional classRural Minor Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating77.5 US tons
Inventory rating46.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length701 ft (213.7 m)
Longest span97 ft (29.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2022)
Projected traffic80 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 Tri-County Br over Iowa River built?

It was built in 1980, making it 45 years old in 2025.

What condition is Tri-County Br over 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 June 2023.

How much traffic does Tri-County Br over Iowa River carry?

About 80 vehicles per day (2022 count).

How long is Tri-County Br over Iowa River?

The structure is 701 ft (213.7 m) long with a longest span of 97 ft (29.6 m) and a deck 32 ft wide.

Who owns Tri-County Br over Iowa River?

It is owned by the County Highway Agency.