COUNTY ROAD 306
Carrying COUNTY ROAD 306 over BRANCH STONY CREEK
9.98 MI N CO LINE, Glenn, California
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
COUNTY ROAD 306 in Glenn, California sits above 4% of rated California bridges on inventory load rating (16 t), while its 1930 build year is earlier than 81% of Glenn's recorded-year cohort (242 bridges).
COUNTY ROAD 306 in Glenn, California is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1930, it carries 1 rated component on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor 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 CA:11C0202
PRE-1950 · CONCRETE · MULTI-SPAN · CULVERT-LED · LOCAL-ADT · LIGHT-LOAD · CAT-POOR
- PRE-1950 Pre-1950
- CONCRETE Concrete
- MULTI-SPAN 2 spans
- CULVERT-LED Culvert-led
- LOCAL-ADT Local ADT
- LIGHT-LOAD Light load
- CAT-POOR Poor
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: COUNTY ROAD 306
The COUNTY ROAD 306 bridge in Glenn, California carries COUNTY ROAD 306 over BRANCH STONY CREEK. It was built in 1930, making it 96 years old today. It was last reconstructed in 1970, extending its service life. The structure is built primarily of concrete continuous and spans 2 sections, stretching 6.7 meters (22 feet) end to end. Daily traffic averages 235 vehicles, placing it in the lower-traffic tier of California bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show culvert at 4/9. The weakest component sits in poor condition. A component scored 4 or below, placing this bridge in the federal Poor condition category rather than declaring it unsafe or closed.
How COUNTY ROAD 306 compares
Age against the county: built in 1930, earlier than 197 of Glenn's 242 bridges with a recorded construction year (81%), against a county median build year of 1953. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across California bridges with a recorded inventory load rating (25,538 of 25,848 rated).
COUNTY ROAD 306 vs every rated California bridge
Inventory load rating (metric tons), FHWA NBI, this state
16 Top 96% higher than 4% of 25,538 bridges
rated California 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.
Glenn inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 242 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
- 1930
- Last Reconstructed
- 1970
- Material
- Concrete Continuous
- Number of Spans
- 2
- Structure Length
- 6.7 m (22 ft) 0
- Owner
- County Highway Agency
- Avg Daily Traffic
- 235 vehicles/day
- Structure Number
- 11C0202
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
COUNTY ROAD 306 is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare COUNTY ROAD 306 against other structures in Glenn and across California. California 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 COUNTY ROAD 306?
COUNTY ROAD 306 in Glenn, California on the FHWA's 0–9 scale.
How often is COUNTY ROAD 306 inspected?
COUNTY ROAD 306'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 235 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. COUNTY ROAD 306 is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for COUNTY ROAD 306?
COUNTY ROAD 306 has an NBI inventory load rating of 16.2 metric tons.
Who is responsible for maintaining COUNTY ROAD 306?
COUNTY ROAD 306 is owned and maintained by County Highway Agency.
How old is COUNTY ROAD 306 and does age affect safety?
COUNTY ROAD 306 was built in 1930, making it 96 years old and last reconstructed in 1970.
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.