US Bridges

NE HWY 99 over Salmon Creek

Good

Clark County, Washington · 0.1 Miles N of NE119th ST · Structure no. 087717000000000

Built
2008
17 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
152 ft
1 main span
Daily traffic
17,395
2023 count
Owner
County
County Highway Agency

About this bridge

NE HWY 99 over Salmon Creek is a prestressed concrete stringer/multi-beam or girder carrying NE HWY 99 over Salmon Creek in Clark County, Washington. It was built in 2008, so it is 17 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 17,395 vehicles a day, roughly 10% of them trucks, projected to reach 25,000 by 2038. The structure is 152 ft (46.3 m) long and 87 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesNE HWY 99
CrossesSalmon Creek
Location0.1 Miles N of NE119th ST
RouteCounty Highway 91110
Coordinates45.7084, -122.64888
Functional classUrban Other Principal 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
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 rating62.2 US tons
Inventory rating47.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length152 ft (46.3 m)
Longest span147 ft (44.7 m)
Deck width87 ft (26.4 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,395 (2023)
Projected traffic25,000 by 2038
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$9.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NE HWY 99 over Salmon Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is NE HWY 99 over Salmon 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 September 2024.

How much traffic does NE HWY 99 over Salmon Creek carry?

About 17,395 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NE HWY 99 over Salmon Creek?

The structure is 152 ft (46.3 m) long with a longest span of 147 ft (44.7 m) and a deck 87 ft wide.

Who owns NE HWY 99 over Salmon Creek?

It is owned by the County Highway Agency.