US Bridges

X 99 Franklin ST over Iowa River

Good

Louisa County, Iowa · 74032703 · Structure no. 000000000034201

Built
2020
5 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,199 ft
8 main spans
Daily traffic
880
2022 count
Owner
County
County Highway Agency

About this bridge

X 99 Franklin ST over Iowa River is a prestressed concrete stringer/multi-beam or girder carrying X 99 Franklin ST over Iowa River in Louisa 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 880 vehicles a day, roughly 15% of them trucks, projected to reach 880 by 2044. The structure is 1,199 ft (365.5 m) long and 44 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesX 99 Franklin ST
CrossesIowa River
Location74032703
RouteCity Street 0
StateIowa
Coordinates41.18006, -91.1831
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHL 93
Structure length1,199 ft (365.5 m)
Longest span152 ft (46.3 m)
Deck width44 ft (13.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic880 (2022)
Projected traffic880 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 X 99 Franklin ST over Iowa River built?

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

What condition is X 99 Franklin ST 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 May 2024.

How much traffic does X 99 Franklin ST over Iowa River carry?

About 880 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is X 99 Franklin ST over Iowa River?

The structure is 1,199 ft (365.5 m) long with a longest span of 152 ft (46.3 m) and a deck 44 ft wide.

Who owns X 99 Franklin ST over Iowa River?

It is owned by the County Highway Agency.