US Bridges

Park Entrance Road over Terrell Creek

Fair

Whatcom County, Washington · Birch Bay State Park · Structure no. 086472000000000

Built
1963
62 years old
Condition
Fair
inspected March 2023
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
135
2012 count
Owner
State
State Park, Forest, or Reservation Agency

About this bridge

Park Entrance Road over Terrell Creek is a concrete channel beam carrying Park Entrance Road over Terrell Creek in Whatcom County, Washington. It was built in 1963, so it is 62 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 6 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 135 vehicles a day, projected to reach 171 by 2036. The structure is 31 ft (9.5 m) long and 17 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesPark Entrance Road
CrossesTerrell Creek
LocationBirch Bay State Park
RouteState Lands Road 51500
CountyWhatcom County
StateWashington
Coordinates48.90336, -122.77056
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33 US tons
Inventory rating20 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckOther
Main spans1
Design loadHS 20
Structure length31 ft (9.5 m)
Longest span31 ft (9.5 m)
Deck width17 ft (5.2 m)
Roadway width11 ft (3.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic135 (2012)
Projected traffic171 by 2036
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Park, Forest, or Reservation Agency
Maintained byState Park, Forest, or Reservation Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$325,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Park Entrance Road over Terrell Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is Park Entrance Road over Terrell Creek 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 Park Entrance Road over Terrell Creek carry?

About 135 vehicles per day (2012 count).

How long is Park Entrance Road over Terrell Creek?

The structure is 31 ft (9.5 m) long with a longest span of 31 ft (9.5 m) and a deck 17 ft wide.

Who owns Park Entrance Road over Terrell Creek?

It is owned by the State Park, Forest, or Reservation Agency.