US Bridges

HWY 100 over Dry Canyon Creek

FairPosted for load

Wasco County, Oregon · 028 MI W Rowena · Structure no. 00524 292 00664

Built
1921
104 years old
Condition
Fair
inspected February 2024
Type
Arch - Deck
Concrete
Length
101 ft
1 main span
Daily traffic
295
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 100 over Dry Canyon Creek is a concrete arch - deck carrying HWY 100 over Dry Canyon Creek in Wasco County, Oregon. It was built in 1921, so it is 104 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 295 vehicles a day, roughly 9% of them trucks, projected to reach 310 by 2042. The structure is 101 ft (30.8 m) long and 23 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesHWY 100
CrossesDry Canyon Creek
Location028 MI W Rowena
RouteState Highway 30
StateOregon
Coordinates45.6814, -121.30354
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26.1 US tons
Inventory rating20 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 15
Structure length101 ft (30.8 m)
Longest span75 ft (22.9 m)
Deck width23 ft (7 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic295 (2022)
Projected traffic310 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$517,000
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 100 over Dry Canyon Creek built?

It was built in 1921, making it 104 years old in 2025.

What condition is HWY 100 over Dry Canyon Creek 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 February 2024.

How much traffic does HWY 100 over Dry Canyon Creek carry?

About 295 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is HWY 100 over Dry Canyon Creek?

The structure is 101 ft (30.8 m) long with a longest span of 75 ft (22.9 m) and a deck 23 ft wide.

Who owns HWY 100 over Dry Canyon Creek?

It is owned by the State Highway Agency.