US Bridges

Mountaindale Road over E Fk Dairy Creek

Fair

Washington County, Oregon · 010 MI N HWY 26 · Structure no. 671358A68400340

Built
1992
33 years old
Condition
Fair
inspected July 2024
Type
Slab
Wood or Timber
Length
76 ft
3 main spans
Daily traffic
2,066
2020 count
Owner
County
County Highway Agency

About this bridge

Mountaindale Road over E Fk Dairy Creek is a wood or timber slab carrying Mountaindale Road over E Fk Dairy Creek in Washington County, Oregon. It was built in 1992, so it is 33 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 2,066 vehicles a day, roughly 10% of them trucks, projected to reach 2,341 by 2025. The structure is 76 ft (23.2 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMountaindale Road
CrossesE Fk Dairy Creek
Location010 MI N HWY 26
RouteCounty Highway A0684
CountyWashington County
StateOregon
Coordinates45.62151, -123.02891
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 alignment8: Equal to present desirable criteria
Operating rating27.1 US tons
Inventory rating21.1 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 25 or greater
Structure length76 ft (23.2 m)
Longest span24 ft (7.3 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,066 (2020)
Projected traffic2,341 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Mountaindale Road over E Fk Dairy Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is Mountaindale Road over E Fk Dairy 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 July 2024.

How much traffic does Mountaindale Road over E Fk Dairy Creek carry?

About 2,066 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Mountaindale Road over E Fk Dairy Creek?

The structure is 76 ft (23.2 m) long with a longest span of 24 ft (7.3 m) and a deck 28 ft wide.

Who owns Mountaindale Road over E Fk Dairy Creek?

It is owned by the County Highway Agency.