US Bridges

G61 310th ST over Stream

Good

Adair County, Iowa · 1.7 MI W of N51 on G61 · Structure no. 000000000055401

Built
2017
8 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete Continuous
Length
143 ft
3 main spans
Daily traffic
45
2022 count
Owner
County
County Highway Agency

About this bridge

G61 310th ST over Stream is a concrete continuous slab carrying G61 310th ST over Stream in Adair County, Iowa. It was built in 2017, so it is 8 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 2043. The structure is 143 ft (43.6 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesG61 310th ST
CrossesStream
Location1.7 MI W of N51 on G61
RouteCounty Highway 0
CountyAdair County
StateIowa
Coordinates41.20123, -94.69492
Functional classRural Major 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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating62.5 US tons
Inventory rating48.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHL 93
Structure length143 ft (43.6 m)
Longest span55 ft (16.8 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2022)
Projected traffic45 by 2043
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was G61 310th ST over Stream built?

It was built in 2017, making it 8 years old in 2025.

What condition is G61 310th 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 G61 310th ST over Stream carry?

About 45 vehicles per day (2022 count).

How long is G61 310th ST over Stream?

The structure is 143 ft (43.6 m) long with a longest span of 55 ft (16.8 m) and a deck 33 ft wide.

Who owns G61 310th ST over Stream?

It is owned by the County Highway Agency.