Kowolski Road
Carrying Kowolski Road over Clear Lake Dam spillway
40 mi SE of Klamath Falls, Modoc, California
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
Kowolski Road in Modoc, California sits above 80% of rated California bridges on inventory load rating (36 t), while its 1999 build year is earlier than 16% of Modoc's recorded-year cohort (87 bridges).
Kowolski Road in Modoc, California is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 1999, it carries 3 rated components 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 CA:KLAM-001
LATE-CENTURY · PRESTRESS · SINGLE-SPAN · TIED-CTRL · TRACE-ADT · STANDARD-LOAD · CAT-GOOD
- LATE-CENTURY 1980–1999
- PRESTRESS Prestressed concrete
- SINGLE-SPAN Single span
- TIED-CTRL Tied control
- TRACE-ADT Trace ADT
- STANDARD-LOAD Standard 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: Kowolski Road
The Kowolski Road bridge in Modoc, California carries Kowolski Road over Clear Lake Dam spillway. It was built in 1999, making it 27 years old today. It was last reconstructed in 2001, extending its service life. The structure is built primarily of prestressed concrete and spans 1 section, stretching 30.8 meters (101 feet) end to end. Daily traffic averages 1 vehicles, placing it in the lower-traffic tier of California bridges. It is owned and maintained by Bureau of Reclamation.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 7/9, substructure 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 Kowolski Road compares
Age against the county: built in 1999, earlier than 14 of Modoc's 87 bridges with a recorded construction year (16%), against a county median build year of 1968. This is one of the newer structures in its county.
Live comparison across California bridges with a recorded inventory load rating (25,538 of 25,848 rated).
Kowolski Road vs every rated California bridge
Inventory load rating (metric tons), FHWA NBI, this state
36 Top 20% higher than 80% 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.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Modoc inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 87 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
- Last Reconstructed
- 2001
- Material
- Prestressed Concrete
- Number of Spans
- 1
- Structure Length
- 30.8 m (101 ft)
- Deck Width
- 4.9 m (16 ft)
- Owner
- Bureau of Reclamation
- Avg Daily Traffic
- 1 vehicles/day
- Structure Number
- KLAM-001
Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • The superstructure (beams and supports above the deck) rates good at 7/9, with no significant deterioration on file.
- • The substructure (piers and abutments) rates good at 7/9, with no significant deterioration on file.
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 Kowolski Road 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 Kowolski Road against other structures in Modoc 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 Kowolski Road?
Kowolski Road in Modoc, California has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is Kowolski Road inspected?
Kowolski Road'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 1 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. Kowolski Road 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 Kowolski Road?
Kowolski Road has an NBI inventory load rating of 36.0 metric tons.
Who is responsible for maintaining Kowolski Road?
Kowolski Road is owned and maintained by Bureau of Reclamation.
How old is Kowolski Road and does age affect safety?
Kowolski Road was built in 1999, making it 27 years old and last reconstructed in 2001.
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.