US Bridges

Farm to Market Rd. over N Drainage Ditch

Fair

Skagit County, Washington · 7.7 N JCT SR 20 · Structure no. 0003939B0000000

Built
1951
74 years old
Condition
Fair
inspected June 2023
Type
Channel Beam
Concrete
Length
32 ft
1 main span
Daily traffic
1,231
2023 count
Owner
County
County Highway Agency

About this bridge

Farm to Market Rd. over N Drainage Ditch is a concrete channel beam carrying Farm to Market Rd. over N Drainage Ditch in Skagit County, Washington. It was built in 1951, so it is 74 years old, older than the Washington average of 49.8 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 1,231 vehicles a day, roughly 7% of them trucks, projected to reach 2,223 by 2043. The structure is 32 ft (9.8 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesFarm to Market Rd.
CrossesN Drainage Ditch
Location7.7 N JCT SR 20
RouteCounty Highway 31010
CountySkagit County
StateWashington
Coordinates48.55733, -122.44436
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating31 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length32 ft (9.8 m)
Longest span30 ft (9 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,231 (2023)
Projected traffic2,223 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$426,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Farm to Market Rd. over N Drainage Ditch built?

It was built in 1951, making it 74 years old in 2025.

What condition is Farm to Market Rd. over N Drainage Ditch 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 June 2023.

How much traffic does Farm to Market Rd. over N Drainage Ditch carry?

About 1,231 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Farm to Market Rd. over N Drainage Ditch?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9 m) and a deck 30 ft wide.

Who owns Farm to Market Rd. over N Drainage Ditch?

It is owned by the County Highway Agency.