US Bridges

Silver Lake Road over Williamson Rv

Good

Klamath County, Oregon · 1784 MI E HWY 97 · Structure no. 18C033067601784

Built
1986
39 years old
Condition
Good
inspected July 2024
Type
Slab
Prestressed Concrete
Length
72 ft
1 main span
Daily traffic
241
2020 count
Owner
County
County Highway Agency

About this bridge

Silver Lake Road over Williamson Rv is a prestressed concrete slab carrying Silver Lake Road over Williamson Rv in Klamath County, Oregon. It was built in 1986, so it is 39 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 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 241 vehicles a day, roughly 10% of them trucks, projected to reach 256 by 2025. The structure is 72 ft (21.9 m) long and 32 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesSilver Lake Road
CrossesWilliamson Rv
Location1784 MI E HWY 97
RouteCounty Highway 0B316
StateOregon
Coordinates42.96529, -121.57848
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length72 ft (21.9 m)
Longest span70 ft (21.3 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic241 (2020)
Projected traffic256 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Silver Lake Road over Williamson Rv built?

It was built in 1986, making it 39 years old in 2025.

What condition is Silver Lake Road over Williamson Rv 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 July 2024.

How much traffic does Silver Lake Road over Williamson Rv carry?

About 241 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Silver Lake Road over Williamson Rv?

The structure is 72 ft (21.9 m) long with a longest span of 70 ft (21.3 m) and a deck 32 ft wide.

Who owns Silver Lake Road over Williamson Rv?

It is owned by the County Highway Agency.