US Bridges

Mill Creek Road over Penny Creek

Good

Snohomish County, Washington · 500 E of SR 527 · Structure no. 087573000000000

Built
2007
18 years old
Condition
Good
inspected August 2023
Type
Slab
Prestressed Concrete
Length
28 ft
1 main span
Daily traffic
17,100
2015 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mill Creek Road over Penny Creek is a prestressed concrete slab carrying Mill Creek Road over Penny Creek in Snohomish County, Washington. It was built in 2007, so it is 18 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 17,100 vehicles a day, roughly 5% of them trucks, projected to reach 18,500 by 2035. The structure is 28 ft (8.5 m) long and 60 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesMill Creek Road
CrossesPenny Creek
Location500 E of SR 527
RouteCity Street 778
Coordinates47.84975, -122.21422
Functional classUrban Minor Arterial

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating29.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length28 ft (8.5 m)
Longest span25 ft (7.7 m)
Deck width60 ft (18.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,100 (2015)
Projected traffic18,500 by 2035
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Mill Creek Road over Penny Creek built?

It was built in 2007, making it 18 years old in 2025.

What condition is Mill Creek Road over Penny 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 August 2023.

How much traffic does Mill Creek Road over Penny Creek carry?

About 17,100 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Mill Creek Road over Penny Creek?

The structure is 28 ft (8.5 m) long with a longest span of 25 ft (7.7 m) and a deck 60 ft wide.

Who owns Mill Creek Road over Penny Creek?

It is owned by the City or Municipal Highway Agency.