SR 121
Carrying SR 121 over BLOOMS DITCH
4.0 E JCT I-5, Thurston, Washington
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: SR 121
The SR 121 bridge in Thurston, Washington carries SR 121 over BLOOMS DITCH. It was built in 2016, making it 10 years old today. The structure is built primarily of concrete and spans 1 section, stretching 8.2 meters (27 feet) end to end. Daily traffic averages 2,711 vehicles, placing it in the moderately-trafficked tier of Washington bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show culvert at 8/9. The weakest component sits in good condition. All reported major components score above the Poor range. Its NBI inventory load rating is 38.6 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How SR 121 compares
Live comparison across Washington.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 2016
- Material
- Concrete
- Number of Spans
- 1
- Structure Length
- 8.2 m (27 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 2,711 vehicles/day
- Structure Number
- 0018853B0000000
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether SR 121 is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare SR 121 against other structures in Thurston and across Washington. Washington bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for SR 121?
SR 121 in Thurston, Washington on the FHWA's 0–9 scale.
How often is SR 121 inspected?
SR 121's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 2,711 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. SR 121 is currently shown as Good condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for SR 121?
SR 121 has an NBI inventory load rating of 38.6 metric tons.
Who is responsible for maintaining SR 121?
SR 121 is owned and maintained by State Highway Agency.
How old is SR 121 and does age affect safety?
SR 121 was built in 2016, making it 10 years old.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.