US Bridges

FM 320th ST over Big Meadow Creek

Fair

Clay County, Iowa · 097363501 · Structure no. 000000000117491

Built
1978
47 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
78 ft
3 main spans
Daily traffic
80
2022 count
Owner
County
County Highway Agency

About this bridge

FM 320th ST over Big Meadow Creek is a concrete continuous slab carrying FM 320th ST over Big Meadow Creek in Clay County, Iowa. It was built in 1978, so it is 47 years old, older 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 80 vehicles a day, projected to reach 80 by 2043. The structure is 78 ft (23.8 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFM 320th ST
CrossesBig Meadow Creek
Location097363501
RouteCounty Highway 0
CountyClay County
StateIowa
Coordinates43.18359, -95.07159
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
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 alignment7: Better than present minimum criteria
Operating rating57.7 US tons
Inventory rating36.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length78 ft (23.8 m)
Longest span29 ft (8.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2022)
Projected traffic80 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 FM 320th ST over Big Meadow Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is FM 320th ST over Big Meadow Creek 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 2023.

How much traffic does FM 320th ST over Big Meadow Creek carry?

About 80 vehicles per day (2022 count).

How long is FM 320th ST over Big Meadow Creek?

The structure is 78 ft (23.8 m) long with a longest span of 29 ft (8.8 m) and a deck 32 ft wide.

Who owns FM 320th ST over Big Meadow Creek?

It is owned by the County Highway Agency.