US 12 MOON RD
Carrying US 12 MOON RD over SLOUGH
1.0 E GRAYS HBR CO, Thurston, Washington
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
US 12 MOON RD in Thurston, Washington sits above 74% of rated Washington bridges on inventory load rating (41 t), while its 1999 build year is earlier than 20% of Thurston's recorded-year cohort (205 bridges).
US 12 MOON RD in Thurston, Washington is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 1999, it carries 1 rated component on the inspecting agency's 0-9 scale, and its weakest reported component scores 7. The lowest applicable rating sets the federal condition category, so this Good result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure WA:0015666A0000000
LATE-CENTURY · CONCRETE · LONG-SPAN-RUN · CULVERT-LED · ARTERIAL-ADT · HEAVY-LOAD · CAT-GOOD
- LATE-CENTURY 1980–1999
- CONCRETE Concrete
- LONG-SPAN-RUN 4 spans
- CULVERT-LED Culvert-led
- ARTERIAL-ADT Arterial ADT
- HEAVY-LOAD Heavy load
- CAT-GOOD Good
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: US 12 MOON RD
The US 12 MOON RD bridge in Thurston, Washington carries US 12 MOON RD over SLOUGH. It was built in 1999, making it 27 years old today. The structure is built primarily of concrete and spans 4 sections, stretching 18.0 meters (59 feet) end to end. Daily traffic averages 9,817 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 7/9. The weakest component sits in good condition. None of this bridge's reported major components fall into the Poor condition range.
How US 12 MOON RD compares
Age against the county: built in 1999, earlier than 41 of Thurston's 205 bridges with a recorded construction year (20%), against a county median build year of 1982. This is one of the newer structures in its county.
Live comparison across Washington bridges with a recorded inventory load rating (8,455 of 8,474 rated).
US 12 MOON RD vs every rated Washington bridge
Inventory load rating (metric tons), FHWA NBI, this state
41 Top 26% higher than 74% of 8,455 bridges
rated Washington bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Thurston inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 205 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1999
- Material
- Concrete
- Number of Spans
- 4
- Structure Length
- 18.0 m (59 ft)
- Deck Width
- 11.0 m (36 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 9,817 vehicles/day
- Structure Number
- 0015666A0000000
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 US 12 MOON RD 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 US 12 MOON RD 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 US 12 MOON RD?
US 12 MOON RD in Thurston, Washington on the FHWA's 0–9 scale.
How often is US 12 MOON RD inspected?
US 12 MOON RD'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 9,817 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. US 12 MOON RD 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 US 12 MOON RD?
US 12 MOON RD has an NBI inventory load rating of 40.8 metric tons.
Who is responsible for maintaining US 12 MOON RD?
US 12 MOON RD is owned and maintained by State Highway Agency.
How old is US 12 MOON RD and does age affect safety?
US 12 MOON RD was built in 1999, making it 27 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.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.