US Bridges

Lewis Road over Chesnimnus Creek

PoorPosted for load

Wallowa County, Oregon · 10.2 MI N of Crow CR Road · Structure no. 063C76C68501015

Built
1975
50 years old
Condition
Poor
inspected September 2024
Type
Girder and Floorbeam System
Steel
Length
33 ft
1 main span
Daily traffic
39
2020 count
Owner
County
County Highway Agency

About this bridge

Lewis Road over Chesnimnus Creek is a steel girder and floorbeam system carrying Lewis Road over Chesnimnus Creek in Wallowa County, Oregon. It was built in 1975, so it is 50 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 2 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. Its operating status is: posted for load restriction.

It carries about 39 vehicles a day, roughly 5% of them trucks, projected to reach 44 by 2025. The structure is 33 ft (10.1 m) long and 20 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesLewis Road
CrossesChesnimnus Creek
Location10.2 MI N of Crow CR Road
RouteCounty Highway 0
StateOregon
Coordinates45.7031, -117.1014
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
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 rating37.8 US tons
Inventory rating22.8 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width20 ft (6 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic39 (2020)
Projected traffic44 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Lewis Road over Chesnimnus Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Lewis Road over Chesnimnus Creek 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 September 2024.

How much traffic does Lewis Road over Chesnimnus Creek carry?

About 39 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Lewis Road over Chesnimnus Creek?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 20 ft wide.

Who owns Lewis Road over Chesnimnus Creek?

It is owned by the County Highway Agency.