US Bridges

320th Ave over Sugar Creek

Good

Clinton County, Iowa · 083E40304 · Structure no. 000000000125221

Built
2003
22 years old
Condition
Good
inspected March 2024
Type
Tee Beam
Prestressed Concrete
Length
57 ft
1 main span
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

320th Ave over Sugar Creek is a prestressed concrete tee beam carrying 320th Ave over Sugar Creek in Clinton County, Iowa. It was built in 2003, so it is 22 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 11 vehicles a day, projected to reach 11 by 2044. The structure is 57 ft (17.4 m) long and 29 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
Carries320th Ave
CrossesSugar Creek
Location083E40304
RouteCounty Highway 0
CountyClinton County
StateIowa
Coordinates42.02945, -90.48114
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 protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 48 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.5 US tons
Inventory rating38.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span56 ft (17.1 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2022)
Projected traffic11 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 320th Ave over Sugar Creek built?

It was built in 2003, making it 22 years old in 2025.

What condition is 320th Ave over Sugar 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 March 2024.

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

About 11 vehicles per day (2022 count).

How long is 320th Ave over Sugar Creek?

The structure is 57 ft (17.4 m) long with a longest span of 56 ft (17.1 m) and a deck 29 ft wide.

Who owns 320th Ave over Sugar Creek?

It is owned by the County Highway Agency.