STACK BROS MECHANICAL CONTRACTORS INC
AUTHORIZEDDBA: STACK BROS
USDOT
1280175
MC Number
1583591
Fleet Size
134
Total Drivers
143
Last updated: March 16, 2026
Safety overview
STACK BROS MECHANICAL CONTRACTORS INC is a large interstate motor carrier based in SUPERIOR, Wisconsin, operating 134 power units with 143 drivers. Their safety profile raises flags: 4 of 5 BASIC categories exceed the 75th percentile, which is where FMCSA considers stepping in. Their driver out-of-service rate of 11.1% runs above the national average of 5.51%. No crashes on file. FMCSA records show 9 inspections for this carrier.
BASIC scores
SMS PercentilesHigher percentile = worse performance relative to peers. Scores at or above 75% may trigger an FMCSA investigation.
Out-of-service rates vs. national average
An out-of-service order means the driver or vehicle was pulled from operation during a roadside inspection.
For reference, the average driver OOS rate in Wisconsin is 8.1% and the average vehicle OOS rate is 27.4% across 62,850 carriers.
Company details
- Entity Type
- N/A
- Carrier Operation
- Interstate
- Operation Classification
- Authorized For Hire, Private (Property)
- Cargo Carried
- N
- Hazmat
- No
- Safety Rating Date
- N/A
What are BASIC scores?
FMCSA tracks carrier performance through its Safety Measurement System (SMS), which scores carriers across six categories called BASICs. Each score is a percentile from 0 to 100, based on inspection and crash data from the past 24 months.
A score of 65 means the carrier performed worse than 65% of its peers. Anything above 75% can trigger FMCSA alerts or investigations. Brokers vetting new carriers should pay attention to scores above 50%.
- Unsafe driving
- Speeding, reckless driving, improper lane changes, seatbelt violations. All based on what officers find during roadside inspections.
- HOS / Fatigue
- Hours-of-service violations, logbook problems, driving past the allowed limits. Fatigued driving is one of the top causes of truck crashes in the US.
- Driver fitness
- Licensing problems, expired medical certificates, and other driver qualification issues.
- Controlled substances
- Drug and alcohol testing violations, possession, or impairment.
- Vehicle maintenance
- Brake problems, tire issues, lighting defects, load securement failures. Caught during the vehicle portion of roadside inspections.
- Crash indicator
- Based on crash history from state-reported data. Higher percentile means more crashes relative to the carrier's size and mileage.
Inspections
9
Total
60%
Driver %
Crash history
0
Total Crashes
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Frequently asked questions
Is STACK BROS MECHANICAL CONTRACTORS INC authorized to operate?
Yes. STACK BROS MECHANICAL CONTRACTORS INC (USDOT #1280175) currently holds "AUTHORIZED" status with FMCSA. They're registered as an interstate carrier.
What is STACK BROS MECHANICAL CONTRACTORS INC's safety record?
STACK BROS MECHANICAL CONTRACTORS INC has 4 BASIC scores above the 75th percentile, which is where FMCSA may look into a carrier. Brokers should weigh these scores alongside the inspection history and crash data before making a decision.
How many trucks does STACK BROS MECHANICAL CONTRACTORS INC operate?
STACK BROS MECHANICAL CONTRACTORS INC operates 134 power units with 143 drivers on file. That puts them in the large carrier category by FMCSA standards.
Does STACK BROS MECHANICAL CONTRACTORS INC transport hazardous materials?
No. STACK BROS MECHANICAL CONTRACTORS INC does not have a hazardous materials flag in the FMCSA database.
Where is STACK BROS MECHANICAL CONTRACTORS INC located?
STACK BROS MECHANICAL CONTRACTORS INC is based in SUPERIOR, Wisconsin at 3119 HILL AVE, 54880. Phone: (715) 398-2964.
What are STACK BROS MECHANICAL CONTRACTORS INC's out-of-service rates?
STACK BROS MECHANICAL CONTRACTORS INC's driver out-of-service rate is 11.1%, compared to the national average of 5.51%. Higher than average, which could point to driver compliance issues. Their vehicle out-of-service rate is 50.0% (national average: 20.72%). Above average, which may point to vehicle maintenance gaps.