US Bridges

Lone Rock Road over Lone Rock Creek

Fair

Gilliam County, Oregon · Lone Rock · Structure no. 23953 828 00000

Built
2020
5 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
76 ft
1 main span
Daily traffic
33
2020 count
Owner
County
County Highway Agency

About this bridge

Lone Rock Road over Lone Rock Creek is a steel stringer/multi-beam or girder carrying Lone Rock Road over Lone Rock Creek in Gilliam County, Oregon. It was built in 2020, so it is 5 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 33 vehicles a day, roughly 5% of them trucks, projected to reach 33 by 2025. The structure is 76 ft (23.3 m) long and 28 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesLone Rock Road
CrossesLone Rock Creek
LocationLone Rock
RouteCounty Highway 0
CountyGilliam County
StateOregon
Coordinates45.08917, -119.88528
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length76 ft (23.3 m)
Longest span74 ft (22.7 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33 (2020)
Projected traffic33 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 Lone Rock Road over Lone Rock Creek built?

It was built in 2020, making it 5 years old in 2025.

What condition is Lone Rock Road over Lone 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 July 2023.

How much traffic does Lone Rock Road over Lone Rock Creek carry?

About 33 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Lone Rock Road over Lone Rock Creek?

The structure is 76 ft (23.3 m) long with a longest span of 74 ft (22.7 m) and a deck 28 ft wide.

Who owns Lone Rock Road over Lone Rock Creek?

It is owned by the County Highway Agency.