US Bridges

320th Ave over Shell Creek

Good

Boone County, Nebraska · 10.5E 3.75S Petersburg · Structure no. C000614517

Built
1985
40 years old
Condition
Good
inspected December 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
30
2003 count
Owner
County
County Highway Agency

About this bridge

320th Ave over Shell Creek is a concrete culvert carrying 320th Ave over Shell Creek in Boone County, Nebraska. It was built in 1985, so it is 40 years old, younger than the Nebraska average of 47.1 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 30 vehicles a day, projected to reach 51 by 2041. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 18.6 mi (30 km).

Location

Open in Google Maps
Carries320th Ave
CrossesShell Creek
Location10.5E 3.75S Petersburg
RouteCounty Highway 145
CountyBoone County
StateNebraska
Coordinates41.796, -97.8714
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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.4 US tons
Inventory rating24.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2003)
Projected traffic51 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 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 320th Ave over Shell Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is 320th Ave over Shell 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 December 2024.

How much traffic does 320th Ave over Shell Creek carry?

About 30 vehicles per day (2003 count).

How long is 320th Ave over Shell Creek?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns 320th Ave over Shell Creek?

It is owned by the County Highway Agency.