US Bridges

Waconda RD over Patterson Creek

FairPosted for load

Marion County, Oregon · 018 MI N-W BROOKLAKE-I-5 · Structure no. 47C42 602

Built
1963
62 years old
Condition
Fair
inspected August 2024
Type
Slab
Wood or Timber
Length
36 ft
2 main spans
Daily traffic
1,141
2020 count
Owner
County
County Highway Agency

About this bridge

Waconda RD over Patterson Creek is a wood or timber slab carrying Waconda RD over Patterson Creek in Marion County, Oregon. It was built in 1963, so it is 62 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 5 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 1,141 vehicles a day, roughly 11% of them trucks, projected to reach 1,272 by 2025. The structure is 36 ft (11 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesWaconda RD
CrossesPatterson Creek
Location018 MI N-W BROOKLAKE-I-5
RouteCounty Highway C0602
CountyMarion County
StateOregon
Coordinates45.07419, -122.9797
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.7 US tons
Inventory rating19 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20
Structure length36 ft (11 m)
Longest span18 ft (5.5 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,141 (2020)
Projected traffic1,272 by 2025
Trucks11%
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 Waconda RD over Patterson Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is Waconda RD over Patterson 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 Waconda RD over Patterson Creek carry?

About 1,141 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is Waconda RD over Patterson Creek?

The structure is 36 ft (11 m) long with a longest span of 18 ft (5.5 m) and a deck 24 ft wide.

Who owns Waconda RD over Patterson Creek?

It is owned by the County Highway Agency.