US Bridges

STC4749; Old HWY 7 over S.Fk.Cottonwood Creek

Good

Idaho County, Idaho · 4.7N. 2.2W. Grangeville · Structure no. 000000000020240

Built
1977
48 years old
Condition
Good
inspected September 2024
Type
Frame
Concrete
Length
25 ft
1 main span
Daily traffic
850
2023 count
Owner
Local
Other Local Agency

About this bridge

STC4749; Old HWY 7 over S.Fk.Cottonwood Creek is a concrete frame carrying STC4749; Old HWY 7 over S.Fk.Cottonwood Creek in Idaho County, Idaho. It was built in 1977, so it is 48 years old, older than the Idaho average of 45.3 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 850 vehicles a day, roughly 20% of them trucks, projected to reach 1,275 by 2042. The structure is 25 ft (7.6 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSTC4749; Old HWY 7
CrossesS.Fk.Cottonwood Creek
Location4.7N. 2.2W. Grangeville
RouteCounty Highway 4749
CountyIdaho County
StateIdaho
Coordinates46.00272, -116.16381
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating32 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width30 ft (9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic850 (2023)
Projected traffic1,275 by 2042
Trucks20%
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

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was STC4749; Old HWY 7 over S.Fk.Cottonwood Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is STC4749; Old HWY 7 over S.Fk.Cottonwood Creek 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 September 2024.

How much traffic does STC4749; Old HWY 7 over S.Fk.Cottonwood Creek carry?

About 850 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is STC4749; Old HWY 7 over S.Fk.Cottonwood Creek?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m) and a deck 30 ft wide.

Who owns STC4749; Old HWY 7 over S.Fk.Cottonwood Creek?

It is owned by the Other Local Agency.