US Bridges

Shadybrook Road over Tygh Creek

Fair

Wasco County, Oregon · 3.8 MI W of HWY 197 · Structure no. 16165 229 00383

Built
1975
50 years old
Condition
Fair
inspected August 2024
Type
Slab
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
16
2020 count
Owner
County
County Highway Agency

About this bridge

Shadybrook Road over Tygh Creek is a prestressed concrete slab carrying Shadybrook Road over Tygh Creek in Wasco 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 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.

It carries about 16 vehicles a day, projected to reach 21 by 2025. The structure is 44 ft (13.4 m) long and 20 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesShadybrook Road
CrossesTygh Creek
Location3.8 MI W of HWY 197
RouteCounty Highway 0
CountyWasco County
StateOregon
Coordinates45.28066, -121.25613
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating64.6 US tons
Inventory rating50 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span42 ft (12.8 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16 (2020)
Projected traffic21 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Shadybrook Road over Tygh Creek built?

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

What condition is Shadybrook Road over Tygh 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 August 2024.

How much traffic does Shadybrook Road over Tygh Creek carry?

About 16 vehicles per day (2020 count).

How long is Shadybrook Road over Tygh Creek?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 20 ft wide.

Who owns Shadybrook Road over Tygh Creek?

It is owned by the County Highway Agency.