Mountain Mud Service & Supply Inc is an active interstate carrier based in Gillette, WY.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 1 | 0 | 0 |
| Tractors | 9 | 0 | 0 |
| Trailers | 20 | 0 | 0 |
| Total Power Units | 10 | ||
Distinct vehicles · 24 mo
vs 10 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 91% | 96% | Worse than most peers |
| HOS Compliance | 93% | 95% | Worse than most peers |
| Driver Fitness | 91% | 96% | Worse than most peers |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 91% | 95% | Worse than most peers |
Lower percentile = lower SMS measure = stronger safety record. Computed nightly across active carriers in the same state and fleet-size band.
| Type | Inspections | OOS | OOS % | Nat'l Avg |
|---|---|---|---|---|
| Driver | 0 | 2 | — | 6.67% |
| Vehicle | 0 | 13 | — | 22.26% |
| Hazmat | 0 | 0 | — |
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| No crashes recorded | 0 | 0 | 0 | 0 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 55 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Feb 4, 2026 | ND | TRUCK TRACTOR | 0 | 0 |
| Jan 7, 2026 | ND | TRUCK TRACTOR | 0 | 0 |
| Oct 7, 2025 | ND | TRUCK TRACTOR | 14 | 2 |
| Oct 1, 2025 | SD | TRUCK TRACTOR | 0 | 0 |
| Sep 30, 2025 |
Carriers that share an officer, phone, or email with this DOT.
| Insp w/ Viol |
|---|
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 1 | 0.40 | — |
| HOS Compliance | 2 | 0.31 | — |
| Vehicle Maintenance | 10 | 14.94 | — |
| Driver Fitness | 1 | 0.28 | — |
| Controlled Substances | 0 | 0.00 | — |
| 4.44% |
Where they run
Inspected in 4 states. Top state ND accounts for 45% of activity. Activity outside home state (WY): 68%.
| 14 |
| Driver Fitness | 2 | 1 | 1 |
| Hours-of-Service Compliance | 2 | 0 | 1 |
| Unsafe Driving | 1 | 0 | 0 |
| ND |
| TRUCK TRACTOR |
| 0 |
| 0 |
| Jul 31, 2025 | SD | TRUCK TRACTOR | 4 | 0 |
| Jun 28, 2025 | ND | TRUCK TRACTOR | 2 | 0 |
| Jun 26, 2025 | SD | TRUCK TRACTOR | 0 | 0 |
| May 9, 2025 | WY | TRUCK TRACTOR | 5 | 2 |
| Apr 24, 2025 | WY | STRAIGHT TRUCK | 0 | 0 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| Oct 7, 2025 | 3965BL | Lubrication - Oil or grease leak | Vehicle Maintenance | — |
| Oct 7, 2025 | 39311A1CSLRR | Conspicuity Systems - Truck tractor lower rear retro reflective sheeting missing on vehicle manufactured on or after July 1 1997 | Vehicle Maintenance | — |
| Oct 7, 2025 | 393207FSLAS | Suspension - Leaking 3 PSI in 5 minutes | Vehicle Maintenance | — |
| Oct 7, 2025 | 39345B2BAIR | Air Brake - Hose/tubing damaged or not secured | Vehicle Maintenance | — |
| Oct 7, 2025 | 39345DB | Air Brake - Audible air leak at a proper connection | Vehicle Maintenance | — |
| Oct 7, 2025 | 39347E | Brake Out of Adjustment - Roto Clamp (Short & Long) DD-3 or Bolt | Vehicle Maintenance | — |
| Oct 7, 2025 | 39348ABIBD | Drum Brake - Inoperative other than a steering axle | Vehicle Maintenance | — |
| Oct 7, 2025 | 39348ABMBCBD | Drum Brake - Missing/broken component(s) | Vehicle Maintenance | — |
| Oct 7, 2025 | 39353BB | Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear | Vehicle Maintenance | — |
| Oct 7, 2025 | 39355EB | Air Brake - ABS malfunction lamp defective on trailers manufactured on or after March 1 1998 | Vehicle Maintenance | — |