US Bridges

310th ST over Big Whiskey Creek

Good

Plymouth County, Iowa · 090451903 · Structure no. 000000000271431

Built
2008
17 years old
Condition
Good
inspected July 2024
Type
Slab
Concrete
Length
120 ft
3 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

310th ST over Big Whiskey Creek is a concrete slab carrying 310th ST over Big Whiskey Creek in Plymouth County, Iowa. It was built in 2008, so it is 17 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 20 vehicles a day, projected to reach 20 by 2044. The structure is 120 ft (36.6 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries310th ST
CrossesBig Whiskey Creek
Location090451903
RouteCounty Highway 0
StateIowa
Coordinates42.60494, -96.2036
Functional classRural Local

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 protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.8 US tons
Inventory rating46.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span41 ft (12.5 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 310th ST over Big Whiskey Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is 310th ST over Big Whiskey Creek 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 2024.

How much traffic does 310th ST over Big Whiskey Creek carry?

About 20 vehicles per day (2022 count).

How long is 310th ST over Big Whiskey Creek?

The structure is 120 ft (36.6 m) long with a longest span of 41 ft (12.5 m) and a deck 33 ft wide.

Who owns 310th ST over Big Whiskey Creek?

It is owned by the County Highway Agency.