US Bridges

Rd. No. 20 over Elliott Creek

Good

Snohomish County, Washington · M.P. 33.9 Rd. # 20 · Structure no. 060502000001464

Built
1978
47 years old
Condition
Good
inspected July 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
115 ft
1 main span
Daily traffic
140
1992 count
Owner
Federal
U.S. Forest Service

About this bridge

Rd. No. 20 over Elliott Creek is a prestressed concrete stringer/multi-beam or girder carrying Rd. No. 20 over Elliott Creek in Snohomish County, Washington. It was built in 1978, so it is 47 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 140 vehicles a day, roughly 10% of them trucks, projected to reach 210 by 2045. The structure is 115 ft (35.1 m) long and 31 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesRd. No. 20
CrossesElliott Creek
LocationM.P. 33.9 Rd. # 20
RouteFederal Lands Road 20000
Coordinates48.0557, -121.41563
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length115 ft (35.1 m)
Longest span110 ft (33.5 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (1992)
Projected traffic210 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Rd. No. 20 over Elliott Creek built?

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

What condition is Rd. No. 20 over Elliott Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2022.

How much traffic does Rd. No. 20 over Elliott Creek carry?

About 140 vehicles per day (1992 count), of which roughly 10% are trucks.

How long is Rd. No. 20 over Elliott Creek?

The structure is 115 ft (35.1 m) long with a longest span of 110 ft (33.5 m) and a deck 31 ft wide.

Who owns Rd. No. 20 over Elliott Creek?

It is owned by the U.S. Forest Service.