US Bridges

Alfalfa Mkt RD over Coi Main Canal

Fair

Deschutes County, Oregon · 0.25 MI W of Alfalfa · Structure no. 09C125D01 00929

Built
1978
47 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
26 ft
1 main span
Daily traffic
1,030
2020 count
Owner
County
County Highway Agency

About this bridge

Alfalfa Mkt RD over Coi Main Canal is a wood or timber stringer/multi-beam or girder carrying Alfalfa Mkt RD over Coi Main Canal in Deschutes County, Oregon. It was built in 1978, so it is 47 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.

It carries about 1,030 vehicles a day, roughly 5% of them trucks, projected to reach 1,140 by 2025. The structure is 26 ft (7.9 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesAlfalfa Mkt RD
CrossesCoi Main Canal
Location0.25 MI W of Alfalfa
RouteCounty Highway 3154
CountyDeschutes County
StateOregon
Coordinates44.0778, -121.03218
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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
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 rating31.4 US tons
Inventory rating24.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 20
Structure length26 ft (7.9 m)
Longest span20 ft (6.1 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,030 (2020)
Projected traffic1,140 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Alfalfa Mkt RD over Coi Main Canal built?

It was built in 1978, making it 47 years old in 2025.

What condition is Alfalfa Mkt RD over Coi Main 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 Alfalfa Mkt RD over Coi Main Canal carry?

About 1,030 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Alfalfa Mkt RD over Coi Main Canal?

The structure is 26 ft (7.9 m) long with a longest span of 20 ft (6.1 m) and a deck 32 ft wide.

Who owns Alfalfa Mkt RD over Coi Main Canal?

It is owned by the County Highway Agency.