US Bridges

310th ST over Br Big Elkhorn CR

Good

Cedar County, Iowa · 079012301 · Structure no. 000000000101571

Built
2019
6 years old
Condition
Good
inspected May 2022
Type
Culvert
Concrete Continuous
Length
29 ft
2 main spans
Daily traffic
80
2022 count
Owner
County
County Highway Agency

About this bridge

310th ST over Br Big Elkhorn CR is a concrete continuous culvert carrying 310th ST over Br Big Elkhorn CR in Cedar County, Iowa. It was built in 2019, so it is 6 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 80 vehicles a day, projected to reach 80 by 2043. The structure is 29 ft (8.8 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries310th ST
CrossesBr Big Elkhorn CR
Location079012301
RouteCounty Highway 0
CountyCedar County
StateIowa
Coordinates41.64076, -90.93621
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionMay 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating37.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHL 93
Structure length29 ft (8.8 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2022)
Projected traffic80 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 310th ST over Br Big Elkhorn CR built?

It was built in 2019, making it 6 years old in 2025.

What condition is 310th ST over Br Big Elkhorn CR 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 2022.

How much traffic does 310th ST over Br Big Elkhorn CR carry?

About 80 vehicles per day (2022 count).

How long is 310th ST over Br Big Elkhorn CR?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m).

Who owns 310th ST over Br Big Elkhorn CR?

It is owned by the County Highway Agency.