Structure 6394 002 00252 · Clackamas County, OR

Barlow Trail RD over Hackett Creek

Carries Barlow Trail RD over Hackett Creek, 4.0 Mi W Of Lolo Pass RD.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT30 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 5/9 · sets the rating

30 ft end to end. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a slab bridge.

Built196561 years old
Length29.5 ft9 m
Daily traffic—reported figure implausible
Last inspectedJuly 2024every 24 months

Location

StateOregon
CountyClackamas
Location4.0 Mi W Of Lolo Pass RD
CarriesBarlow Trail RD
CrossesHackett Creek
Coordinates45.37453, -122.00333

Physical Characteristics

MaterialPrestressed Concrete
DesignSlab
Total Length29.5 ft (9 m)
Max Span29.5 ft (9 m)
Deck Width24.6 ft (7.5 m)
Deck Area67.5 sq m
Main Spans1
Year Built1965

Traffic

Avg Daily Traffic165,900 (2018)
That is about 82,950 vehicles per lane per day — beyond what any U.S. road carries (the busiest freeways run about 25,000–30,000). It is almost certainly a data-entry error in the National Bridge Inventory, so we leave this bridge out of traffic rankings.
Truck Traffic4%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number06394 002 00252

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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