US Bridges

308th Ave over Sugar Creek

Good

Clinton County, Iowa · 308 Ave 3/4 Mile N 110 S · Structure no. 000000000125252

Built
2024
1 years old
Condition
Good
inspected November 2024
Type
Tee Beam
Concrete
Length
49 ft
1 main span
Daily traffic
70
2023 count
Owner
County
County Highway Agency

About this bridge

308th Ave over Sugar Creek is a concrete tee beam carrying 308th Ave over Sugar Creek in Clinton County, Iowa. It was built in 2024, so it is 1 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 70 vehicles a day, projected to reach 70 by 2043. The structure is 49 ft (14.9 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Carries308th Ave
CrossesSugar Creek
Location308 Ave 3/4 Mile N 110 S
RouteCounty Highway 0
StateIowa
Coordinates42.02943, -90.49736
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 protection9 ExcellentNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation9: Superior to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating40.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length49 ft (14.9 m)
Longest span46 ft (14 m)
Deck width29 ft (8.8 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2023)
Projected traffic70 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 308th Ave over Sugar Creek built?

It was built in 2024, making it 1 years old in 2025.

What condition is 308th 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 November 2024.

How much traffic does 308th Ave over Sugar Creek carry?

About 70 vehicles per day (2023 count).

How long is 308th Ave over Sugar Creek?

The structure is 49 ft (14.9 m) long with a longest span of 46 ft (14 m) and a deck 29 ft wide.

Who owns 308th Ave over Sugar Creek?

It is owned by the County Highway Agency.