US Bridges

STC2739;ROCK CR RD over Rock Creek

Good

Cassia County, Idaho · 17.8 S. Hanson · Structure no. 000000000019435

Built
1971
54 years old
Condition
Good
inspected October 2023
Type
Frame
Concrete
Length
23 ft
1 main span
Daily traffic
600
2023 count
Owner
Local
Other Local Agency

About this bridge

STC2739;ROCK CR RD over Rock Creek is a concrete frame carrying STC2739;ROCK CR RD over Rock Creek in Cassia County, Idaho. It was built in 1971, so it is 54 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 600 vehicles a day, roughly 7% of them trucks, projected to reach 900 by 2042. The structure is 23 ft (6.9 m) long and 30 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSTC2739;ROCK CR RD
CrossesRock Creek
Location17.8 S. Hanson
RouteCounty Highway 2739
CountyCassia County
StateIdaho
Coordinates42.30575, -114.25719
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 protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 48 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating61 US tons
Inventory rating36 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length23 ft (6.9 m)
Longest span20 ft (6.2 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2023)
Projected traffic900 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 STC2739;ROCK CR RD over Rock Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is STC2739;ROCK CR RD over Rock 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 October 2023.

How much traffic does STC2739;ROCK CR RD over Rock Creek carry?

About 600 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is STC2739;ROCK CR RD over Rock Creek?

The structure is 23 ft (6.9 m) long with a longest span of 20 ft (6.2 m) and a deck 30 ft wide.

Who owns STC2739;ROCK CR RD over Rock Creek?

It is owned by the Other Local Agency.