US Bridges

Ia 117 over South Skunk River

Fair

Jasper County, Iowa · 0.7 Mile S of JCT I-80 · Structure no. 000000000030730

Built
1967
58 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
322 ft
4 main spans
Daily traffic
6,300
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 117 over South Skunk River is a steel continuous stringer/multi-beam or girder carrying Ia 117 over South Skunk River in Jasper County, Iowa. It was built in 1967, so it is 58 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 6,300 vehicles a day, roughly 8% of them trucks, projected to reach 6,300 by 2042. The structure is 322 ft (98.1 m) long and 39 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesIa 117
CrossesSouth Skunk River
Location0.7 Mile S of JCT I-80
RouteState Highway 117
CountyJasper County
StateIowa
Coordinates41.68094, -93.24658
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.6 US tons
Inventory rating27.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length322 ft (98.1 m)
Longest span90 ft (27.4 m)
Deck width39 ft (11.9 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,300 (2022)
Projected traffic6,300 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 117 over South Skunk River built?

It was built in 1967, making it 58 years old in 2025.

What condition is Ia 117 over South Skunk River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2023.

How much traffic does Ia 117 over South Skunk River carry?

About 6,300 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Ia 117 over South Skunk River?

The structure is 322 ft (98.1 m) long with a longest span of 90 ft (27.4 m) and a deck 39 ft wide.

Who owns Ia 117 over South Skunk River?

It is owned by the State Highway Agency.