US Bridges

HWY 171 over Clack Rvr. (cripple Cr.)

Fair

Clackamas County, Oregon · 22.3 MI SE Estacada · Structure no. 08990 171 04583

Built
1952
73 years old
Condition
Fair
inspected August 2023
Type
Truss - Thru
Steel
Length
267 ft
1 main span
Daily traffic
299
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 171 over Clack Rvr. (cripple Cr.) is a steel truss - thru carrying HWY 171 over Clack Rvr. (cripple Cr.) in Clackamas County, Oregon. It was built in 1952, so it is 73 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.

It carries about 299 vehicles a day, roughly 21% of them trucks, projected to reach 310 by 2042. The structure is 267 ft (81.3 m) long and 29 ft wide. If it were closed, the detour would be 52.8 mi (85 km).

Location

Open in Google Maps
CarriesHWY 171
CrossesClack Rvr. (cripple Cr.)
Location22.3 MI SE Estacada
RouteState Highway 224
CountyClackamas County
StateOregon
Coordinates45.11619, -122.07516
Functional classRural Major Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.8 US tons
Inventory rating20.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+1 approach)
Design loadH 20
Structure length267 ft (81.3 m)
Longest span240 ft (73.1 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic299 (2022)
Projected traffic310 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.8 mi (85 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 171 over Clack Rvr. (cripple Cr.) built?

It was built in 1952, making it 73 years old in 2025.

What condition is HWY 171 over Clack Rvr. (cripple Cr.) 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 2023.

How much traffic does HWY 171 over Clack Rvr. (cripple Cr.) carry?

About 299 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is HWY 171 over Clack Rvr. (cripple Cr.)?

The structure is 267 ft (81.3 m) long with a longest span of 240 ft (73.1 m) and a deck 29 ft wide.

Who owns HWY 171 over Clack Rvr. (cripple Cr.)?

It is owned by the State Highway Agency.