Hazmat Carrier Finder

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Stack Bros Mechanical Contractors Inc

As of Oct 22, 2026, Stack Bros Mechanical Contractors Inc in Superior, Wisconsin reports 134 power units and 143 drivers on its MCS-150, not rated by FMCSA.

3119 Hill Ave, Superior, Wisconsin 54880 (715) 398-2964

Verified Oct 22, 2026 against FMCSA Company Census File (data.transportation.gov)

Stack Bros Mechanical Contractors Inc (USDOT 1280175, MC-1583591), doing business as Stack Bros, is an active motor carrier based in Superior, Wisconsin that FMCSA's census classifies as for-hire and that declares hazardous materials on its MCS-150. Operation: interstate. Operating authority: active for-hire authority (MC). Fleet: 134 power units and 143 drivers (24 with CDLs). Power units count straight trucks as well as tractors, so they can exceed the tractor count. It reported 37,215 miles for 2025 on its MCS-150. Cargo classes declared: building materials, construction, machinery, large objects. It is also classified as a private carrier of its own goods. FMCSA has not issued it a safety rating (no compliance review on record). In the last 24 months it had 9 roadside inspections, 4 of them (44.4%) with an out-of-service order; no reportable crash. Registration (MCS-150) last updated October 15, 2026.

Key facts

Fleet size 100–499 power units Power units, banded. source, unchanged since Oct 20, 2026
FMCSA safety rating Not rated Satisfactory, Conditional or Unsatisfactory after an FMCSA compliance review; most carriers have never had one and are not rated. source, unchanged since Oct 21, 2026
Rating age Not rated How old the FMCSA safety rating is. A rating reflects one compliance review on that date, not current performance; old ratings say little about the carrier today. source
Registration update overdue No The MCS-150 was last updated more than two years ago, past FMCSA's two-year update requirement; fleet, driver and cargo figures may be out of date. source, unchanged since Oct 20, 2026
Operation Interstate Interstate, intrastate hazmat or intrastate non-hazmat, as declared on the MCS-150. source, unchanged since Oct 20, 2026
Cargo classes (MCS-150) Building materials, Construction, Machinery, large objects Cargo the carrier declared it hauls on its latest MCS-150 (FMCSA's fixed cargo list). source, unchanged since Oct 20, 2026
Driver count 100–499 drivers Total drivers, banded. source, unchanged since Oct 20, 2026
Last MCS-150 update Oct 15, 2026 When the carrier last updated its registration (required at least every two years). source, unchanged since Oct 20, 2026
Out-of-service share (24 months) Over 20% out of service The share of the carrier's roadside inspections in the last 24 months that ended in an out-of-service order. A carrier with few inspections can swing on one result. source
Roadside inspections (24 months) 9 Roadside inspections of the carrier's drivers and vehicles in FMCSA's Safety Measurement System file, which covers the last 24 months and is refreshed monthly. source
Reportable crashes (24 months) 0 Crashes involving the carrier's vehicles that met FMCSA's reporting threshold (a death, an injury treated away from the scene, or a vehicle towed away) in the last 24 months. A crash on record does not mean the carrier caused it. source
Doing business as Stack Bros source, unchanged since Oct 20, 2026
USDOT number 1280175 source, unchanged since Oct 20, 2026
MC docket MC-1583591 source, unchanged since Oct 20, 2026
Operating authority Active for-hire authority (MC) source, unchanged since Oct 20, 2026
Power units 134 source, unchanged since Oct 20, 2026
Tractors (owned or leased) 5 source, unchanged since Oct 20, 2026
Trailers (owned or leased) 35 source, unchanged since Oct 20, 2026
Drivers 143 source, unchanged since Oct 20, 2026
CDL drivers 24 source, unchanged since Oct 20, 2026
Miles reported (MCS-150) 37,215 miles source, unchanged since Oct 20, 2026
Mileage year 2025 source, unchanged since Oct 20, 2026
Also hauls its own freight Yes source, unchanged since Oct 20, 2026
USDOT registered since Aug 27, 2004 source, unchanged since Oct 20, 2026
Inspections with an out-of-service order (24 months) 4 source
Hazmat inspections (24 months) 0 source
Hazmat out-of-service orders (24 months) 0 source
Deaths in those crashes 0 source
Injuries in those crashes 0 source
Crashes with a hazmat release (24 months) 0 source

Source event history

Source dates and first observation are different.

  1. Oct 15, 2026: Filed an MCS-150 update Official source
  2. Aug 27, 2004: Registered with FMCSA Official source

Dates on this record

Source updatedOct 22, 2026 (FMCSA census rows last updated (portal metadata) (the whole dataset, not this record))
CollectedOct 22, 2026, 10:22 PM ET (the last successful check of the source that included this record)
EffectiveFiled an MCS-150 update: Oct 15, 2026; Registered with FMCSA: Aug 27, 2004 (when the source says each fact took effect)
RetiredNot retired: the source is still maintained (whether the dataset is still maintained)

In Superior, Wisconsin

10 hazmat carriers in the dataset are in Superior, Wisconsin; 4 have profiles on this site. Hazmat carriers in Superior, Wisconsin

FMCSA safety rating (all 10 here): Satisfactory 8 (80%) · Not rated 2 (20%)

Rating age (all 10 here): Rating over 10 years old 8 (80%) · Not rated 2 (20%)

Fleet size (all 10 in this group): 100–499 power units (3) · 25–99 power units (3) · 10–24 power units (3) · 500+ power units (1)

Cargo classes (MCS-150) (all 10 in this group; a record can count under several values): Building materials (8) · Construction (8) · Machinery, large objects (7) · General freight (6) · Other cargo (5) · Chemicals (4) · 22 other values (57)

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Something wrong or out of date? Suggest a correction. Source record ID 1280175.