US Bridges

FM 300th ST over Drainage Ditch

Fair

Clay County, Iowa · 097352201 · Structure no. 000000000117250

Built
1963
62 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
128 ft
3 main spans
Daily traffic
469
2022 count
Owner
County
County Highway Agency

About this bridge

FM 300th ST over Drainage Ditch is a concrete continuous slab carrying FM 300th ST over Drainage Ditch in Clay County, Iowa. It was built in 1963, so it is 62 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 5 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 469 vehicles a day, roughly 27% of them trucks, projected to reach 469 by 2043. The structure is 128 ft (39 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesFM 300th ST
CrossesDrainage Ditch
Location097352201
RouteCounty Highway 0
CountyClay County
StateIowa
Coordinates43.21544, -94.96377
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating27.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length128 ft (39 m)
Longest span49 ft (14.9 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic469 (2022)
Projected traffic469 by 2043
Trucks27%
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 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 300th ST over Drainage Ditch built?

It was built in 1963, making it 62 years old in 2025.

What condition is FM 300th ST over Drainage Ditch 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 300th ST over Drainage Ditch carry?

About 469 vehicles per day (2022 count), of which roughly 27% are trucks.

How long is FM 300th ST over Drainage Ditch?

The structure is 128 ft (39 m) long with a longest span of 49 ft (14.9 m) and a deck 30 ft wide.

Who owns FM 300th ST over Drainage Ditch?

It is owned by the County Highway Agency.