US Bridges

FM 300th ST over Small Stream

Fair

Delaware County, Iowa · 087061701 · Structure no. 000000000140121

Built
1978
47 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete Continuous
Length
33 ft
3 main spans
Daily traffic
324
2022 count
Owner
County
County Highway Agency

About this bridge

FM 300th ST over Small Stream is a concrete continuous culvert carrying FM 300th ST over Small Stream in Delaware 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 324 vehicles a day, roughly 18% of them trucks, projected to reach 324 by 2044. The structure is 33 ft (10.1 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFM 300th ST
CrossesSmall Stream
Location087061701
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.35464, -91.55926
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.4 US tons
Inventory rating21.4 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic324 (2022)
Projected traffic324 by 2044
Trucks18%
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 Small Stream built?

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

What condition is FM 300th ST over Small Stream 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 October 2024.

How much traffic does FM 300th ST over Small Stream carry?

About 324 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is FM 300th ST over Small Stream?

The structure is 33 ft (10.1 m) long with a longest span of 10 ft (3 m).

Who owns FM 300th ST over Small Stream?

It is owned by the County Highway Agency.