US Bridges

Mt Richmond RD over Unnamed Creek

Good

Washington County, Oregon · 0042 MI S Patton Valley · Structure no. 23990C120800037

Built
2020
5 years old
Condition
Good
inspected September 2024
Type
Slab
Prestressed Concrete
Length
75 ft
1 main span
Daily traffic
305
2020 count
Owner
County
County Highway Agency

About this bridge

Mt Richmond RD over Unnamed Creek is a prestressed concrete slab carrying Mt Richmond RD over Unnamed Creek in Washington County, Oregon. It was built in 2020, so it is 5 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 305 vehicles a day, roughly 10% of them trucks, projected to reach 345 by 2025. The structure is 75 ft (22.9 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesMt Richmond RD
CrossesUnnamed Creek
Location0042 MI S Patton Valley
RouteCounty Highway C1208
StateOregon
Coordinates45.43509, -123.20667
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating46.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length75 ft (22.9 m)
Longest span72 ft (21.9 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic305 (2020)
Projected traffic345 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Mt Richmond RD over Unnamed Creek built?

It was built in 2020, making it 5 years old in 2025.

What condition is Mt Richmond RD over Unnamed Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does Mt Richmond RD over Unnamed Creek carry?

About 305 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Mt Richmond RD over Unnamed Creek?

The structure is 75 ft (22.9 m) long with a longest span of 72 ft (21.9 m) and a deck 28 ft wide.

Who owns Mt Richmond RD over Unnamed Creek?

It is owned by the County Highway Agency.