US Bridges

310th ST over Small Stream

Good

Buchanan County, Iowa · 087082001 · Structure no. 000000000081191

Built
2019
6 years old
Condition
Good
inspected December 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
45
2021 count
Owner
County
County Highway Agency

About this bridge

310th ST over Small Stream is a steel stringer/multi-beam or girder carrying 310th ST over Small Stream in Buchanan County, Iowa. It was built in 2019, so it is 6 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 45 vehicles a day, projected to reach 45 by 2042. The structure is 40 ft (12.2 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries310th ST
CrossesSmall Stream
Location087082001
RouteCounty Highway 0
CountyBuchanan County
StateIowa
Coordinates42.34203, -91.7947
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.5 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width35 ft (10.8 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2021)
Projected traffic45 by 2042
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 310th ST over Small Stream built?

It was built in 2019, making it 6 years old in 2025.

What condition is 310th ST over Small Stream in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2022.

How much traffic does 310th ST over Small Stream carry?

About 45 vehicles per day (2021 count).

How long is 310th ST over Small Stream?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 35 ft wide.

Who owns 310th ST over Small Stream?

It is owned by the County Highway Agency.