US Bridges

South Merrill Road over Lost River

Good

Klamath County, Oregon · 0009 MI S HWY 39 · Structure no. 22249 110300009

Built
2015
10 years old
Condition
Good
inspected March 2023
Type
Tee Beam
Prestressed Concrete Continuous
Length
159 ft
3 main spans
Daily traffic
884
2020 count
Owner
County
County Highway Agency

About this bridge

South Merrill Road over Lost River is a prestressed concrete continuous tee beam carrying South Merrill Road over Lost River in Klamath County, Oregon. It was built in 2015, so it is 10 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 884 vehicles a day, roughly 25% of them trucks, projected to reach 934 by 2025. The structure is 159 ft (48.5 m) long and 47 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

CarriesSouth Merrill Road
CrossesLost River
Location0009 MI S HWY 39
RouteCounty Highway 0B307
StateOregon
Coordinates42.02271, -121.60009
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating38.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadHL 93
Structure length159 ft (48.5 m)
Longest span156 ft (47.5 m)
Deck width47 ft (14.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic884 (2020)
Projected traffic934 by 2025
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed26.7 mi (43 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 South Merrill Road over Lost River built?

It was built in 2015, making it 10 years old in 2025.

What condition is South Merrill Road over Lost River 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 March 2023.

How much traffic does South Merrill Road over Lost River carry?

About 884 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is South Merrill Road over Lost River?

The structure is 159 ft (48.5 m) long with a longest span of 156 ft (47.5 m) and a deck 47 ft wide.

Who owns South Merrill Road over Lost River?

It is owned by the County Highway Agency.