US Bridges

Blackwell Park RD over Willamina Creek

PoorPosted for load

Yamhill County, Oregon · At Blackwell Co. Park. · Structure no. 11883 000

Built
1965
60 years old
Condition
Poor
inspected September 2024
Type
Truss - Thru
Steel
Length
120 ft
1 main span
Daily traffic
31
2020 count
Owner
County
County Highway Agency

About this bridge

Blackwell Park RD over Willamina Creek is a steel truss - thru carrying Blackwell Park RD over Willamina Creek in Yamhill County, Oregon. It was built in 1965, so it is 60 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 31 vehicles a day, projected to reach 36 by 2025. The structure is 120 ft (36.6 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesBlackwell Park RD
CrossesWillamina Creek
LocationAt Blackwell Co. Park.
RouteCounty Highway C0010
CountyYamhill County
StateOregon
Coordinates45.13494, -123.4889
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be 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 rating25.4 US tons
Inventory rating19.6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span80 ft (24.4 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31 (2020)
Projected traffic36 by 2025
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 statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$615,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Blackwell Park RD over Willamina Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is Blackwell Park RD over Willamina Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does Blackwell Park RD over Willamina Creek carry?

About 31 vehicles per day (2020 count).

How long is Blackwell Park RD over Willamina Creek?

The structure is 120 ft (36.6 m) long with a longest span of 80 ft (24.4 m) and a deck 18 ft wide.

Who owns Blackwell Park RD over Willamina Creek?

It is owned by the County Highway Agency.