US Bridges

310th Street over Small

Good

Butler County, Iowa · 090162201 · Structure no. 000000000364960

Built
2005
20 years old
Condition
Good
inspected April 2021
Type
Tee Beam
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
49
2022 count
Owner
County
County Highway Agency

About this bridge

310th Street over Small is a prestressed concrete tee beam carrying 310th Street over Small in Butler County, Iowa. It was built in 2005, so it is 20 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 49 vehicles a day, projected to reach 49 by 2043. The structure is 51 ft (15.5 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries310th Street
CrossesSmall
Location090162201
RouteCounty Highway 0
StateIowa
Coordinates42.59942, -92.72243
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating68.6 US tons
Inventory rating39.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span50 ft (15.2 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic49 (2022)
Projected traffic49 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 310th Street over Small built?

It was built in 2005, making it 20 years old in 2025.

What condition is 310th Street over Small 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 April 2021.

How much traffic does 310th Street over Small carry?

About 49 vehicles per day (2022 count).

How long is 310th Street over Small?

The structure is 51 ft (15.5 m) long with a longest span of 50 ft (15.2 m) and a deck 30 ft wide.

Who owns 310th Street over Small?

It is owned by the County Highway Agency.