US Bridges

FM 255th ST over Small Stream

Fair

Delaware County, Iowa · 088062405 · Structure no. 000000000141210

Built
1959
66 years old
Condition
Fair
inspected February 2023
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
344
2022 count
Owner
County
County Highway Agency

About this bridge

FM 255th ST over Small Stream is a concrete culvert carrying FM 255th ST over Small Stream in Delaware County, Iowa. It was built in 1959, so it is 66 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 344 vehicles a day, roughly 15% of them trucks, projected to reach 344 by 2043. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFM 255th ST
CrossesSmall Stream
Location088062405
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.42002, -91.48486
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating86 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length26 ft (7.9 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic344 (2022)
Projected traffic344 by 2043
Trucks15%
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 255th ST over Small Stream built?

It was built in 1959, making it 66 years old in 2025.

What condition is FM 255th 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 February 2023.

How much traffic does FM 255th ST over Small Stream carry?

About 344 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is FM 255th ST over Small Stream?

The structure is 26 ft (7.9 m) long with a longest span of 13 ft (4 m).

Who owns FM 255th ST over Small Stream?

It is owned by the County Highway Agency.