US Bridges

330th ST over Stream

Good

Adair County, Iowa · 0.9 MI W of P13 on 330th · Structure no. 000000000055231

Built
2021
4 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete Continuous
Length
101 ft
3 main spans
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

330th ST over Stream is a concrete continuous slab carrying 330th ST over Stream in Adair County, Iowa. It was built in 2021, so it is 4 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 26 vehicles a day, projected to reach 26 by 2043. The structure is 101 ft (30.7 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
Carries330th ST
CrossesStream
Location0.9 MI W of P13 on 330th
RouteCounty Highway 0
CountyAdair County
StateIowa
Coordinates41.17216, -94.51506
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 protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 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 rating55 US tons
Inventory rating42.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length101 ft (30.7 m)
Longest span39 ft (11.9 m)
Deck width27 ft (8.3 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 330th ST over Stream built?

It was built in 2021, making it 4 years old in 2025.

What condition is 330th 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 April 2023.

How much traffic does 330th ST over Stream carry?

About 26 vehicles per day (2022 count).

How long is 330th ST over Stream?

The structure is 101 ft (30.7 m) long with a longest span of 39 ft (11.9 m) and a deck 27 ft wide.

Who owns 330th ST over Stream?

It is owned by the County Highway Agency.