US Bridges

Or 138 (hwy 138) over N Umpqua Rv (lone Rock)

FairPosted for load

Douglas County, Oregon · 17.9 MI E of HWY 99 · Structure no. 02496 073 01786

Built
1954
71 years old
Condition
Fair
inspected July 2024
Type
Truss - Thru
Steel
Length
514 ft
1 main span
Daily traffic
1,942
2022 count
Owner
State
State Highway Agency

About this bridge

Or 138 (hwy 138) over N Umpqua Rv (lone Rock) is a steel truss - thru carrying Or 138 (hwy 138) over N Umpqua Rv (lone Rock) in Douglas County, Oregon. It was built in 1954, so it is 71 years old, older 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. Its operating status is: posted for other load-capacity restriction.

It carries about 1,942 vehicles a day, roughly 21% of them trucks, projected to reach 2,000 by 2042. The structure is 514 ft (156.8 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesOr 138 (hwy 138)
CrossesN Umpqua Rv (lone Rock)
Location17.9 MI E of HWY 99
RouteState Highway 138
CountyDouglas County
StateOregon
Coordinates43.3094, -123.07365
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.3 US tons
Inventory rating22.5 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadH 20
Structure length514 ft (156.8 m)
Longest span200 ft (61 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck15 ft (4.4 m)

Traffic and service

Average daily traffic1,942 (2022)
Projected traffic2,000 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 138 (hwy 138) over N Umpqua Rv (lone Rock) built?

It was built in 1954, making it 71 years old in 2025.

What condition is Or 138 (hwy 138) over N Umpqua Rv (lone Rock) 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 2024.

How much traffic does Or 138 (hwy 138) over N Umpqua Rv (lone Rock) carry?

About 1,942 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is Or 138 (hwy 138) over N Umpqua Rv (lone Rock)?

The structure is 514 ft (156.8 m) long with a longest span of 200 ft (61 m) and a deck 30 ft wide.

Who owns Or 138 (hwy 138) over N Umpqua Rv (lone Rock)?

It is owned by the State Highway Agency.