US Bridges

Robb Mill Road over Ellendale Creek

Fair

Polk County, Oregon · 005 NW of County Road 20 · Structure no. 21564 760300054

Built
2011
14 years old
Condition
Fair
inspected August 2024
Type
Slab
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
73
2020 count
Owner
County
County Highway Agency

About this bridge

Robb Mill Road over Ellendale Creek is a prestressed concrete slab carrying Robb Mill Road over Ellendale Creek in Polk County, Oregon. It was built in 2011, so it is 14 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 73 vehicles a day, projected to reach 106 by 2040. The structure is 30 ft (9.1 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesRobb Mill Road
CrossesEllendale Creek
Location005 NW of County Road 20
RouteCounty Highway C7603
CountyPolk County
StateOregon
Coordinates44.93207, -123.37173
Functional classRural Local

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
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating53.6 US tons
Inventory rating41.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic73 (2020)
Projected traffic106 by 2040
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Robb Mill Road over Ellendale Creek built?

It was built in 2011, making it 14 years old in 2025.

What condition is Robb Mill Road over Ellendale 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 Robb Mill Road over Ellendale Creek carry?

About 73 vehicles per day (2020 count).

How long is Robb Mill Road over Ellendale Creek?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 24 ft wide.

Who owns Robb Mill Road over Ellendale Creek?

It is owned by the County Highway Agency.