US Bridges

HWY 370 over Pilot Butte Canal

Fair

Deschutes County, Oregon · 002 MI E HWY 4 JCT · Structure no. 03379 370 00021

Built
1961
64 years old
Condition
Fair
inspected March 2023
Type
Slab
Prestressed Concrete
Length
20 ft
1 main span
Daily traffic
3,656
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 370 over Pilot Butte Canal is a prestressed concrete slab carrying HWY 370 over Pilot Butte Canal in Deschutes County, Oregon. It was built in 1961, so it is 64 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 3,656 vehicles a day, roughly 20% of them trucks, projected to reach 5,500 by 2042. The structure is 20 ft (6.1 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesHWY 370
CrossesPilot Butte Canal
Location002 MI E HWY 4 JCT
RouteState Highway 370
CountyDeschutes County
StateOregon
Coordinates44.3127, -121.16721
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
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 protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment7: Better than present minimum criteria
Operating rating25 US tons
Inventory rating19.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length20 ft (6.1 m)
Longest span19 ft (5.8 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,656 (2022)
Projected traffic5,500 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 HWY 370 over Pilot Butte Canal built?

It was built in 1961, making it 64 years old in 2025.

What condition is HWY 370 over Pilot Butte Canal 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 March 2023.

How much traffic does HWY 370 over Pilot Butte Canal carry?

About 3,656 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is HWY 370 over Pilot Butte Canal?

The structure is 20 ft (6.1 m) long with a longest span of 19 ft (5.8 m) and a deck 32 ft wide.

Who owns HWY 370 over Pilot Butte Canal?

It is owned by the State Highway Agency.