US Bridges

I 35 over South Skunk Rvr Overflow

Good

Story County, Iowa · 1.9 Mi. S of US 30 · Structure no. 000000000700680

Built
2017
8 years old
Condition
Good
inspected July 2023
Type
Culvert
Concrete
Length
66 ft
4 main spans
Daily traffic
48,300
2023 count
Owner
State
State Highway Agency

About this bridge

I 35 over South Skunk Rvr Overflow is a concrete culvert carrying I 35 over South Skunk Rvr Overflow in Story County, Iowa. It was built in 2017, so it is 8 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 48,300 vehicles a day, roughly 18% of them trucks, projected to reach 48,300 by 2043. The structure is 66 ft (20 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI 35
CrossesSouth Skunk Rvr Overflow
Location1.9 Mi. S of US 30
RouteInterstate 35
StateIowa
Coordinates41.97985, -93.57048
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.2 US tons
Inventory rating37.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHL 93
Structure length66 ft (20 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic48,300 (2023)
Projected traffic48,300 by 2043
Trucks18%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 35 over South Skunk Rvr Overflow built?

It was built in 2017, making it 8 years old in 2025.

What condition is I 35 over South Skunk Rvr Overflow 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 July 2023.

How much traffic does I 35 over South Skunk Rvr Overflow carry?

About 48,300 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is I 35 over South Skunk Rvr Overflow?

The structure is 66 ft (20 m) long with a longest span of 15 ft (4.6 m).

Who owns I 35 over South Skunk Rvr Overflow?

It is owned by the State Highway Agency.