US Bridges

Mcquiston Road over Seven Mile Canal

FairPosted for load

Klamath County, Oregon · 109 MI S of 7-MI Road · Structure no. 35C154134300190

Built
1984
41 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
63 ft
2 main spans
Daily traffic
15
2020 count
Owner
County
County Highway Agency

About this bridge

Mcquiston Road over Seven Mile Canal is a wood or timber stringer/multi-beam or girder carrying Mcquiston Road over Seven Mile Canal in Klamath County, Oregon. It was built in 1984, so it is 41 years old, younger 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. Its operating status is: posted for load restriction.

It carries about 15 vehicles a day, roughly 10% of them trucks, projected to reach 17 by 2025. The structure is 63 ft (19.2 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesMcquiston Road
CrossesSeven Mile Canal
Location109 MI S of 7-MI Road
RouteCounty Highway C1343
CountyKlamath County
StateOregon
Coordinates42.64653, -122.05126
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
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
DeckWood or timber
Main spans2
Design loadHS 20
Structure length63 ft (19.2 m)
Longest span31 ft (9.4 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2020)
Projected traffic17 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Mcquiston Road over Seven Mile Canal built?

It was built in 1984, making it 41 years old in 2025.

What condition is Mcquiston Road over Seven Mile 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 Mcquiston Road over Seven Mile Canal carry?

About 15 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Mcquiston Road over Seven Mile Canal?

The structure is 63 ft (19.2 m) long with a longest span of 31 ft (9.4 m) and a deck 32 ft wide.

Who owns Mcquiston Road over Seven Mile Canal?

It is owned by the County Highway Agency.