US Bridges

Benson Street over Interstate I-35

Good

Clarke County, Iowa · 3.0 Mi. N. SR J14 · Structure no. 000000000020110

Built
1969
56 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
219 ft
4 main spans
Daily traffic
45
2022 count
Owner
State
State Highway Agency

About this bridge

Benson Street over Interstate I-35 is a prestressed concrete stringer/multi-beam or girder carrying Benson Street over Interstate I-35 in Clarke County, Iowa. It was built in 1969, so it is 56 years old, older 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 45 vehicles a day, projected to reach 45 by 2043. The structure is 219 ft (66.8 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesBenson Street
CrossesInterstate I-35
Location3.0 Mi. N. SR J14
RouteCounty Highway 0
StateIowa
Coordinates40.91366, -93.79773
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.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating67.7 US tons
Inventory rating25.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length219 ft (66.8 m)
Longest span69 ft (21 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2022)
Projected traffic45 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Benson Street over Interstate I-35 built?

It was built in 1969, making it 56 years old in 2025.

What condition is Benson Street over Interstate I-35 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 Benson Street over Interstate I-35 carry?

About 45 vehicles per day (2022 count).

How long is Benson Street over Interstate I-35?

The structure is 219 ft (66.8 m) long with a longest span of 69 ft (21 m) and a deck 31 ft wide.

Who owns Benson Street over Interstate I-35?

It is owned by the State Highway Agency.