US Bridges

NW Shadybrook Road over Mckay Creek

Fair

Washington County, Oregon · 027 MI NE of North Plains · Structure no. 671353A68500000

Built
1983
42 years old
Condition
Fair
inspected August 2024
Type
Slab
Prestressed Concrete
Length
57 ft
1 main span
Daily traffic
3,925
2020 count
Owner
County
County Highway Agency

About this bridge

NW Shadybrook Road over Mckay Creek is a prestressed concrete slab carrying NW Shadybrook Road over Mckay Creek in Washington County, Oregon. It was built in 1983, so it is 42 years old, younger 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 3,925 vehicles a day, roughly 5% of them trucks, projected to reach 4,445 by 2025. The structure is 57 ft (17.4 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNW Shadybrook Road
CrossesMckay Creek
Location027 MI NE of North Plains
RouteCounty Highway A0685
CountyWashington County
StateOregon
Coordinates45.62525, -122.97505
Functional classRural Major 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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating75.9 US tons
Inventory rating46 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span56 ft (17.1 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,925 (2020)
Projected traffic4,445 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$292,000
NavigationNo navigation control on waterway

Frequently asked questions

When was NW Shadybrook Road over Mckay Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is NW Shadybrook Road over Mckay 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 NW Shadybrook Road over Mckay Creek carry?

About 3,925 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is NW Shadybrook Road over Mckay Creek?

The structure is 57 ft (17.4 m) long with a longest span of 56 ft (17.1 m) and a deck 28 ft wide.

Who owns NW Shadybrook Road over Mckay Creek?

It is owned by the County Highway Agency.