US Bridges

FM 320th Ave over Dd #22

Fair

Clay County, Iowa · 094352602 · Structure no. 000000000115741

Built
2003
22 years old
Condition
Fair
inspected March 2021
Type
Slab
Concrete
Length
30 ft
1 main span
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

FM 320th Ave over Dd #22 is a concrete slab carrying FM 320th Ave over Dd #22 in Clay 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 20 vehicles a day, projected to reach 20 by 2043. The structure is 30 ft (9.1 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFM 320th Ave
CrossesDd #22
Location094352602
RouteCounty Highway 0
CountyClay County
StateIowa
Coordinates42.93292, -94.95352
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.7 US tons
Inventory rating38.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span29 ft (8.8 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 FM 320th Ave over Dd #22 built?

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

What condition is FM 320th Ave over Dd #22 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2021.

How much traffic does FM 320th Ave over Dd #22 carry?

About 20 vehicles per day (2022 count).

How long is FM 320th Ave over Dd #22?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 30 ft wide.

Who owns FM 320th Ave over Dd #22?

It is owned by the County Highway Agency.