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ROCK-N-DIRT INC
Mammoth Lakes, CA
CarrierChk vetting signal
No flags raised
Authority, insurance, safety rating, crash records and out-of-service rates checked
FMCSA status: Active registration · no operating authority · DOT 1284432
Active
No Safety Rating
Broker Vetting Summary
Key signals from current FMCSA records
Authority
No Active Authority
Common carrier
Insurance
Not Found
No coverage amount on file
Safety
Not Rated
40.0% OOS · 5 inspections on record
✓ No risk flags found on authority or insurance records
Vetting notes
- Active FMCSA registration, but no active for-hire operating authority on record
- Previously ordered out of service on January 3, 2005 (New Entrant Revoked - Refusal of Audit/No Contact) — no longer active
- Registered with FMCSA as a private carrier — not registered to haul other companies' freight for hire
- No active insurance filing found on record
- Driver out-of-service rate 50.0% — above the 5.5% national average
- Vehicle out-of-service rate 40.0% — above the 20.7% national average
- 5 FMCSA inspections on record
Company Information
Registration, contact and cargo details
FMCSA Registration
DOT Number
1284432
Safety Rating
Not Rated
Operation Classification
Private (property)
MCS-150 Filed
February 6, 2025
FMCSA Registration
September 10, 2004
Annual Mileage
20,000 mi (2024)
Contact Information
Address
364 South Industrial Circle, Mammoth Lakes, CA 93546
Phone
Email
Owner / Officer
Darren D. Twilegar
Officer 2
Jean A. Twilegar
Cargo Types
Building MaterialsDry BulkConstruction MaterialsOther Cargo
Safety Snapshot
Out-of-service rates, violations and crashes
Safety & Inspection Summary
Total Inspections
5
Driver Inspections
2
Vehicle Inspections
5
Out-of-Service Violations
6
Violations by Category
Vehicle Maintenance12
Unsafe Driving1
Hours of Service1
OOS Rates vs. National Average
Driver OOS Rate50.0% · national avg 5.5%
⚠ Above national average (44.5pp higher)
Vehicle OOS Rate40.0% · national avg 20.7%
⚠ Above national average (19.3pp higher)
40.0% of 5 inspections in the last 24 months put a driver or vehicle out of service —
71st percentile among carriers with 5–9 inspections (lower is better).
CarrierChk calculation from FMCSA roadside inspection records, not an FMCSA score.
Inspection Trend by Year
2026
2025
Violation Rate by Category
Share of roadside inspections in FMCSA's rolling 24-month window that found a violation in each category. The individual violations are listed under each inspection in Inspection Details below. None of this is the basis of the safety rating, which comes from an on-site compliance review.
Vehicle Maintenance
3 of 5 inspections
Unsafe Driving
1 of 5 inspections
Hours of Service
1 of 5 inspections
Driver Fitness
0 of 5 inspections
Controlled Substances
0 of 5 inspections
Fleet & Operating Areas
Observed roadside activity and equipment
Where This Carrier Operates
States where this carrier's roadside inspections were recorded
FewerMore
CA5
Fleet & Equipment (5)
Vehicles identified in this carrier's inspection history. Year, make, model and equipment type are decoded from the VIN.
Power units
~3
of 7 reported to FMCSA
Trailers
~2
seen at inspection
Equipment types observed
Chassis / Incomplete
1
Dump
1
Semi-trailer
1
Tractor
1
Truck
1
Units on record
| Vehicle | Type | VIN | Inspections | With OOS |
|---|---|---|---|---|
| Coza | Semi-trailer | 1C9W44207T1167001 | 2 | 1 |
| 2014 Mack GU (Granite) | Truck · Class 8 | 1M2AX07C0EM019580 | 2 | — |
| 2012 Peterbilt 367 | Tractor · Class 8 | 1XPTD49XXCD151271 | 2 | 1 |
| 2013 Big Tex | Dump · 14 ft | 16VDX1424D5H96413 | 1 | 1 |
| 2021 Ford F-550 | Chassis / Incomplete · Class 5 | 1FD0W5HT6MEC54763 | 1 | 1 |
A vehicle appearing here was recorded in an inspection — it is not proof the carrier still operates it today.
Inspection Details
Each roadside inspection with its violations
Inspection Records (5)
| Date | Report # | Location | Level | Viol | OOS | Shipper | Unit Type | Make | VIN | License |
|---|---|---|---|---|---|---|---|---|---|---|
| July 17, 2026 | UGIG000598 | CA, CA | I | 5 | 2 | N/A | Straight Truck Semi-trailer |
FORD BIG TEX |
1FD0W5HT6MEC54763 16VDX1424D5H96413 |
CA 09082E4 CA 4TN7469 |
| 396.3A1-STLT | OOSSteering - Looseness in the threaded joint of a tie rod or drag link | Steering Mechanism | ||||||||
| 396.3A1-BOS | OOSBrake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination | Brake Out Of Service | ||||||||
| 390.21TB2-DOT | Operate a CMV without USDOT number displayed. Must be preceded by the letters USDOT | |||||||||
| 393.47A-BCFSHE | Hydraulic/Electric Brake - Contaminated friction surface | Brakes All Others | ||||||||
| 393.47A-BCFSHE | Hydraulic/Electric Brake - Contaminated friction surface | Brakes All Others | ||||||||
| June 1, 2026 | UGIG000525 | CA, CA | II | — | — | GRANITE CONSTRUCTION | Straight Truck |
MACK |
1M2AX07C0EM019580 |
CA 77280K2 |
| May 29, 2026 | UGIG000521 | CA, CA | II | 4 | — | N/A | Truck Tractor Semi-trailer |
PETERBILT COZA |
1XPTD49XXCD151271 1C9W44207T1167001 |
CA 9E38586 OK 5950JV |
| 392.2-SLLIRP | State/Local Laws - IRP apportioned tag or registration violation | |||||||||
| 393.45D-BAAL | Air Brake - Audible air leak at other than a proper connection | Brakes All Others | ||||||||
| 392.2-SLLSOA | State/Local Laws - State operating authority violation | |||||||||
| 392.2-SLLS3 | State/Local Laws - Speeding 11-14 miles per hour over the speed limit | Speeding 3 | ||||||||
| May 30, 2025 | UH6M000265 | N/B COUNTY LINE, CA | II | 1 | — | ROCK N DIRT | Straight Truck |
MACK |
1M2AX07C0EM019580 |
CA 77280K2 |
| 392.2-SLLSR | State/Local Laws - State registration/tag violation | |||||||||
| May 21, 2025 | NC0Q003813 | CACHE CREEK SCALES, CA | I | 8 | 4 | NONE | Truck Tractor Semi-trailer |
PETERBILT COZA |
1XPTD49XXCD151271 1C9W44207T1167001 |
CA 9E38586 OK 5950JV |
| 393.207A-SAPPCBLM | OOSSuspension - Axle positioning part cracked/broken/loose/missing. | Suspension | ||||||||
| 393.209D-STPAL | OOSSteering - Pitman arm loose on the output shaft | Steering Mechanism | ||||||||
| 396.3A1-BOS | OOSBrake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination | Brake Out Of Service | ||||||||
| 395.8A1-HOSP | OOSHOS (Property) - Failing to have a record of duty status using the method prescribed | Incomplete/Wrong Log | ||||||||
| 393.95A4-EEUS | Emergency Equipment - Fire Extinguishers - unsecured | Emergency Equipment | ||||||||
| 393.9A-LFTSI | Lighting - Front - Turn signal - inoperative | Lighting | ||||||||
| 393.47D2-BLTBD | Drum Brake - Inadequate lining/pad thickness | Brakes All Others | ||||||||
| 393.47D2-BLTBD | Drum Brake - Inadequate lining/pad thickness | Brakes All Others | ||||||||
Shippers Seen at Inspections
Shipper names recorded by roadside inspectors over roughly the last three years. Only inspected loads appear, so this is a sample of who the carrier hauls for, not a complete customer list. Names are as entered at the roadside; blanks and placeholders such as “N/A” or “same as carrier” are left out.
| Shipper | Inspections | Most recent |
|---|---|---|
| GRANITE CONSTRUCTION | 1 | June 1, 2026 |
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Data sourced from FMCSA MCMIS via Socrata. Record last updated: November 2, 2026.
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