US Bridges

Nelson Lane over So. Fk. Rock Creek

Fair

Power County, Idaho · 3.0 N. 1.5 W. Rockland · Structure no. 000000000023498

Built
1985
40 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
20
2023 count
Owner
County
County Highway Agency

About this bridge

Nelson Lane over So. Fk. Rock Creek is a concrete culvert carrying Nelson Lane over So. Fk. Rock Creek in Power County, Idaho. It was built in 1985, so it is 40 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 20 vehicles a day, roughly 1% of them trucks, projected to reach 30 by 2039. The structure is 25 ft (7.6 m) long and 24 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesNelson Lane
CrossesSo. Fk. Rock Creek
Location3.0 N. 1.5 W. Rockland
RouteCounty Highway 0
CountyPower County
StateIdaho
Coordinates42.61781, -112.90681
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2023)
Projected traffic30 by 2039
Trucks1%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$243,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nelson Lane over So. Fk. Rock Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is Nelson Lane over So. Fk. Rock Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does Nelson Lane over So. Fk. Rock Creek carry?

About 20 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Nelson Lane over So. Fk. Rock Creek?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 24 ft wide.

Who owns Nelson Lane over So. Fk. Rock Creek?

It is owned by the County Highway Agency.