US Bridges

320th Ave over Creek

Good

Clinton County, Iowa · 082E43502 · Structure no. 000000000123921

Built
2021
4 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
70 ft
1 main span
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

320th Ave over Creek is a steel stringer/multi-beam or girder carrying 320th Ave over Creek in Clinton County, Iowa. It was built in 2021, so it is 4 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 26 vehicles a day, projected to reach 26 by 2043. The structure is 70 ft (21.2 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries320th Ave
CrossesCreek
Location082E43502
RouteCounty Highway 0
CountyClinton County
StateIowa
Coordinates41.86951, -90.47096
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.3 US tons
Inventory rating60.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length70 ft (21.2 m)
Longest span65 ft (19.8 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 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 proposedNone recorded
Estimated improvement cost$120 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was 320th Ave over Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is 320th Ave over 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 August 2023.

How much traffic does 320th Ave over Creek carry?

About 26 vehicles per day (2022 count).

How long is 320th Ave over Creek?

The structure is 70 ft (21.2 m) long with a longest span of 65 ft (19.8 m) and a deck 32 ft wide.

Who owns 320th Ave over Creek?

It is owned by the County Highway Agency.