US Bridges

Harpold RD over Irrigation Canal

Fair

Klamath County, Oregon · 014 Miles No JCT FAS 169 · Structure no. 18C001109700140

Built
1960
65 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
37 ft
2 main spans
Daily traffic
902
2020 count
Owner
County
County Highway Agency

About this bridge

Harpold RD over Irrigation Canal is a wood or timber stringer/multi-beam or girder carrying Harpold RD over Irrigation Canal in Klamath County, Oregon. It was built in 1960, so it is 65 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 6 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 902 vehicles a day, roughly 10% of them trucks, projected to reach 962 by 2025. The structure is 37 ft (11.3 m) long and 30 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesHarpold RD
CrossesIrrigation Canal
Location014 Miles No JCT FAS 169
RouteCounty Highway 0B308
CountyKlamath County
StateOregon
Coordinates42.03297, -121.44767
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be 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 rating23.3 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span18 ft (5.5 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic902 (2020)
Projected traffic962 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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 Harpold RD over Irrigation Canal built?

It was built in 1960, making it 65 years old in 2025.

What condition is Harpold RD over Irrigation 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 February 2023.

How much traffic does Harpold RD over Irrigation Canal carry?

About 902 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Harpold RD over Irrigation Canal?

The structure is 37 ft (11.3 m) long with a longest span of 18 ft (5.5 m) and a deck 30 ft wide.

Who owns Harpold RD over Irrigation Canal?

It is owned by the County Highway Agency.