CSAH 20
Carrying CSAH 20 over STREAM
0.4 MI E OF JCT CR 66, Rock, Minnesota
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
CSAH 20 in Rock, Minnesota sits above 1% of rated Minnesota bridges on inventory load rating (12 t), while its 1952 build year is earlier than 94% of Rock's recorded-year cohort (265 bridges).
CSAH 20 in Rock, Minnesota is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1952, it carries 1 rated component on the inspecting agency's 0-9 scale, and its weakest reported component scores 5. The lowest applicable rating sets the federal condition category, so this Fair 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 MN:L2152
INTERSTATE-ERA · TIMBER · MULTI-SPAN · CULVERT-LED · LOCAL-ADT · LIGHT-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- TIMBER Wood or timber
- MULTI-SPAN 2 spans
- CULVERT-LED Culvert-led
- LOCAL-ADT Local ADT
- LIGHT-LOAD Light load
- CAT-FAIR Fair
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: CSAH 20
The CSAH 20 bridge in Rock, Minnesota carries CSAH 20 over STREAM. It was built in 1952, making it 74 years old today. The structure is built primarily of wood or timber and spans 2 sections, stretching 7.0 meters (23 feet) end to end. Daily traffic averages 266 vehicles, placing it in the lower-traffic tier of Minnesota bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show culvert at 5/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How CSAH 20 compares
Age against the county: built in 1952, earlier than 250 of Rock's 265 bridges with a recorded construction year (94%), against a county median build year of 1996. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Minnesota bridges with a recorded inventory load rating (13,532 rated).
CSAH 20 vs every rated Minnesota bridge
Inventory load rating (metric tons), FHWA NBI, this state
12 Top 99% higher than 1% of 13,532 bridges
rated Minnesota 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.
Rock inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 265 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
- 1952
- Material
- Wood or Timber
- Number of Spans
- 2
- Structure Length
- 7.0 m (23 ft) 0
- Owner
- County Highway Agency
- Avg Daily Traffic
- 266 vehicles/day
- Structure Number
- L2152
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 CSAH 20 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 CSAH 20 against other structures in Rock and across Minnesota. Minnesota 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 CSAH 20?
CSAH 20 in Rock, Minnesota on the FHWA's 0–9 scale.
How often is CSAH 20 inspected?
CSAH 20'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 266 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. CSAH 20 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 CSAH 20?
CSAH 20 has an NBI inventory load rating of 12.0 metric tons.
Who is responsible for maintaining CSAH 20?
CSAH 20 is owned and maintained by County Highway Agency.
How old is CSAH 20 and does age affect safety?
CSAH 20 was built in 1952, making it 74 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.