US Bridges

Flinn Road over Mcelroy Slough

Good

Skagit County, Washington · 300 Ft E Blanchard RD · Structure no. 088013000000000

Built
2006
19 years old
Condition
Good
inspected June 2023
Type
Slab
Prestressed Concrete
Length
48 ft
1 main span
Daily traffic
20
2021 count
Owner
County
County Highway Agency

About this bridge

Flinn Road over Mcelroy Slough is a prestressed concrete slab carrying Flinn Road over Mcelroy Slough in Skagit County, Washington. It was built in 2006, so it is 19 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 20 vehicles a day, projected to reach 30 by 2041. The structure is 48 ft (14.6 m) long and 20 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesFlinn Road
CrossesMcelroy Slough
Location300 Ft E Blanchard RD
RouteCounty Highway 24800
CountySkagit County
StateWashington
Coordinates48.59358, -122.41581
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 rating82.9 US tons
Inventory rating63.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length48 ft (14.6 m)
Longest span45 ft (13.7 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2021)
Projected traffic30 by 2041
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 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$365,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Flinn Road over Mcelroy Slough built?

It was built in 2006, making it 19 years old in 2025.

What condition is Flinn Road over Mcelroy Slough 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 June 2023.

How much traffic does Flinn Road over Mcelroy Slough carry?

About 20 vehicles per day (2021 count).

How long is Flinn Road over Mcelroy Slough?

The structure is 48 ft (14.6 m) long with a longest span of 45 ft (13.7 m) and a deck 20 ft wide.

Who owns Flinn Road over Mcelroy Slough?

It is owned by the County Highway Agency.