US Bridges

HWY 164 over Santiam River

FairPosted for load

Marion County, Oregon · 005 MI S Jefferson · Structure no. 01582 164 00624

Built
1933
92 years old
Condition
Fair
inspected July 2023
Type
Arch - Thru
Concrete Continuous
Length
802 ft
3 main spans
Daily traffic
8,644
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 164 over Santiam River is a concrete continuous arch - thru carrying HWY 164 over Santiam River in Marion County, Oregon. It was built in 1933, so it is 92 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 other load-capacity restriction.

It carries about 8,644 vehicles a day, roughly 9% of them trucks, projected to reach 12,400 by 2042. The structure is 802 ft (244.4 m) long and 34 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesHWY 164
CrossesSantiam River
Location005 MI S Jefferson
RouteState Highway 164
CountyMarion County
StateOregon
Coordinates44.71486, -123.01435
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeArch - Thru
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3 (+4 approach)
Design loadH 15
Structure length802 ft (244.4 m)
Longest span200 ft (61 m)
Deck width34 ft (10.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck21 ft (6.3 m)

Traffic and service

Average daily traffic8,644 (2022)
Projected traffic12,400 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.5 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was HWY 164 over Santiam River built?

It was built in 1933, making it 92 years old in 2025.

What condition is HWY 164 over Santiam River 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 July 2023.

How much traffic does HWY 164 over Santiam River carry?

About 8,644 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is HWY 164 over Santiam River?

The structure is 802 ft (244.4 m) long with a longest span of 200 ft (61 m) and a deck 34 ft wide.

Who owns HWY 164 over Santiam River?

It is owned by the State Highway Agency.