Birch Bay Lynden over Bertrand CR

Whatcom County, Washington · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

• Birch Bay Lynden over Bertrand CR in Whatcom County, Washington, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
• It was built in 1949 and reconstructed in 1982, making it 76 years old at the 2025 inventory.
• It carries about 8,369 vehicles a day (traffic count year 2023).
• Its listed owner is the county highway agency.
• It is one of 178 of the 355 inventoried bridges in Whatcom County rated fair (50.1%); 20 (5.6%) are rated poor.
• Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
• Its condition class and component ratings are unchanged from the 2024 inventory.
• Its most recent inspection on record is dated October 2023, on a 24-month routine inspection cycle.
• A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

View this bridge on a map → (48.94833, -122.53333)

Component ratings

Bridge details

Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.

Busiest bridges in Whatcom County

All bridges nearby: Whatcom County, WA bridge conditions · every bridge in Whatcom County · Washington bridges.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.