US Bridges

340th ST over Stream

Good

Calhoun County, Iowa · 086340101 · Structure no. 000000000090641

Built
2023
2 years old
Condition
Good
inspected March 2024
Type
Culvert
Concrete
Length
34 ft
2 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

340th ST over Stream is a concrete culvert carrying 340th ST over Stream in Calhoun County, Iowa. It was built in 2023, so it is 2 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 20 vehicles a day, projected to reach 20 by 2044. The structure is 34 ft (10.4 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries340th ST
CrossesStream
Location086340101
RouteCounty Highway 0
CountyCalhoun County
StateIowa
Coordinates42.29608, -94.7512
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert9 ExcellentNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating61.4 US tons
Inventory rating47.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length34 ft (10.4 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2044
Trucks0%
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 340th ST over Stream built?

It was built in 2023, making it 2 years old in 2025.

What condition is 340th ST over 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 March 2024.

How much traffic does 340th ST over Stream carry?

About 20 vehicles per day (2022 count).

How long is 340th ST over Stream?

The structure is 34 ft (10.4 m) long with a longest span of 16 ft (4.9 m).

Who owns 340th ST over Stream?

It is owned by the County Highway Agency.