US Bridges

Bishop RD over Mill Creek

FairPosted for load

Marion County, Oregon · 008M SE Aumsville · Structure no. 47C71 870

Built
1969
56 years old
Condition
Fair
inspected August 2024
Type
Slab
Wood or Timber
Length
56 ft
3 main spans
Daily traffic
319
2020 count
Owner
County
County Highway Agency

About this bridge

Bishop RD over Mill Creek is a wood or timber slab carrying Bishop RD over Mill Creek in Marion County, Oregon. It was built in 1969, so it is 56 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. Its operating status is: posted for load restriction.

It carries about 319 vehicles a day, roughly 4% of them trucks, projected to reach 356 by 2025. The structure is 56 ft (17.1 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesBishop RD
CrossesMill Creek
Location008M SE Aumsville
RouteCounty Highway C0870
StateOregon
Coordinates44.83499, -122.85549
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 statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 20
Structure length56 ft (17.1 m)
Longest span18 ft (5.5 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic319 (2020)
Projected traffic356 by 2025
Trucks4%
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 Bishop RD over Mill Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is Bishop RD over Mill 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 Bishop RD over Mill Creek carry?

About 319 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is Bishop RD over Mill Creek?

The structure is 56 ft (17.1 m) long with a longest span of 18 ft (5.5 m) and a deck 25 ft wide.

Who owns Bishop RD over Mill Creek?

It is owned by the County Highway Agency.