US Bridges

Cayuse Ridge Road over Chesnimnus Ck

Poor

Wallowa County, Oregon · Near JCT 4695/4695140 · Structure no. 061602000001034

Built
1964
61 years old
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
32 ft
1 main span
Daily traffic
10
2001 count
Owner
Federal
U.S. Forest Service

About this bridge

Cayuse Ridge Road over Chesnimnus Ck is a wood or timber stringer/multi-beam or girder carrying Cayuse Ridge Road over Chesnimnus Ck in Wallowa County, Oregon. It was built in 1964, so it is 61 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 10 vehicles a day, projected to reach 15 by 2045. The structure is 32 ft (9.8 m) long and 16 ft wide.

CarriesCayuse Ridge Road
CrossesChesnimnus Ck
LocationNear JCT 4695/4695140
RouteFederal Lands Road 46951
StateOregon
Coordinates45.7545, -116.99847
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be 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 rating77.4 US tons
Inventory rating55.6 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadOther
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2001)
Projected traffic15 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Cayuse Ridge Road over Chesnimnus Ck built?

It was built in 1964, making it 61 years old in 2025.

What condition is Cayuse Ridge Road over Chesnimnus Ck in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does Cayuse Ridge Road over Chesnimnus Ck carry?

About 10 vehicles per day (2001 count).

How long is Cayuse Ridge Road over Chesnimnus Ck?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 16 ft wide.

Who owns Cayuse Ridge Road over Chesnimnus Ck?

It is owned by the U.S. Forest Service.