MAPES LANE RD 305
Carrying MAPES LANE RD 305 over SUSAN RIVER OVERFLOW # 5
3.3 MI E OF LAMBERT LANE, Lassen, California
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: MAPES LANE RD 305
The MAPES LANE RD 305 bridge in Lassen, California carries MAPES LANE RD 305 over SUSAN RIVER OVERFLOW # 5. It was built in 2016, making it 10 years old today. The structure is built primarily of concrete continuous and spans 6 sections, stretching 36.6 meters (120 feet) end to end. Daily traffic averages 130 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 a deck rating of 7/9, superstructure at 7/9, substructure at 5/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range. Its NBI inventory load rating is 32.4 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How MAPES LANE RD 305 compares
Live comparison across California.
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 How the historical reference is calculated.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 Continuous
- Number of Spans
- 6
- Structure Length
- 36.6 m (120 ft)
- Deck Width
- 10.8 m (35 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 130 vehicles/day
- Structure Number
- 07C0100
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) rates good at 7/9, with no significant deterioration on file.
- • The superstructure (beams and supports above the deck) is in good condition (7/9), showing no significant deterioration.
- • The substructure (piers and abutments) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
How to read this record
This page shows what the last federal inspection recorded, not whether MAPES LANE RD 305 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 MAPES LANE RD 305 against other structures in Lassen 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 MAPES LANE RD 305?
MAPES LANE RD 305 in Lassen, California has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is MAPES LANE RD 305 inspected?
MAPES LANE RD 305'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 130 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. MAPES LANE RD 305 is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for MAPES LANE RD 305?
MAPES LANE RD 305 has an NBI inventory load rating of 32.4 metric tons.
Who is responsible for maintaining MAPES LANE RD 305?
MAPES LANE RD 305 is owned and maintained by County Highway Agency.
How old is MAPES LANE RD 305 and does age affect safety?
MAPES LANE RD 305 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.