US Bridges

SR 116 over Portage Canal

Fair

Jefferson County, Washington · 2.7 E JCT SR 19 · Structure no. 080439000000000

Built
1951
74 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Steel
Length
670 ft
1 main span
Daily traffic
3,152
2023 count
Owner
State
State Highway Agency

About this bridge

SR 116 over Portage Canal is a steel box beam or girders - multiple carrying SR 116 over Portage Canal in Jefferson 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 5 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 3,152 vehicles a day, roughly 4% of them trucks, projected to reach 3,788 by 2039. The structure is 670 ft (204.2 m) long and 26 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesSR 116
CrossesPortage Canal
Location2.7 E JCT SR 19
RouteState Highway 116
CountyJefferson County
StateWashington
Coordinates48.03149, -122.73319
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.9 US tons
Inventory rating30 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadHS 20
Structure length670 ft (204.2 m)
Longest span245 ft (74.7 m)
Deck width26 ft (7.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,152 (2023)
Projected traffic3,788 by 2039
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkSTRAHNET connector

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$8.9 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR 116 over Portage Canal built?

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

What condition is SR 116 over Portage Canal 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 March 2023.

How much traffic does SR 116 over Portage Canal carry?

About 3,152 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is SR 116 over Portage Canal?

The structure is 670 ft (204.2 m) long with a longest span of 245 ft (74.7 m) and a deck 26 ft wide.

Who owns SR 116 over Portage Canal?

It is owned by the State Highway Agency.