Updated Oct 22, 2026

Duncan & Son Lines Inc

As of Oct 22, 2026, Duncan & Son Lines Inc in Buckeye, Arizona reports 259 power units and 231 drivers on its MCS-150, FMCSA safety rating: satisfactory.

23860 W US Hwy 85, Buckeye, Arizona 85326 (623) 386-4511

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

Duncan & Son Lines Inc (USDOT 44035, MC-144606) is an active motor carrier based in Buckeye, Arizona 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: 259 power units and 231 drivers (231 with CDLs). It reported 23,801,483 miles for 2025 on its MCS-150. Cargo classes declared: chemicals, general freight, intermodal containers, building materials, construction, machinery, large objects, metal: sheets, coils, rolls, grain, feed, hay, refrigerated food, paper products, meat, other cargo (other: Scrap Metal). FMCSA safety rating: satisfactory, from a compliance review on October 13, 2010, 16 years ago; it reflects that review, not current performance. In the last 24 months it had 423 roadside inspections, 47 of them (11.1%) with an out-of-service order; 22 hazmat inspections; 14 reportable crashes (0 deaths, 4 injuries); a crash on record does not by itself mean the carrier caused it. Registration (MCS-150) last updated February 10, 2026.

Key facts

Fleet size	100–499 power units Power units, banded. source
FMCSA safety rating	Satisfactory Satisfactory, Conditional or Unsatisfactory after an FMCSA compliance review; most carriers have never had one and are not rated. source
Rating age	Rating over 10 years old 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last updated more than two years ago, past FMCSA's two-year update requirement; fleet, driver and cargo figures may be out of date.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
Operation	Interstate Interstate, intrastate hazmat or intrastate non-hazmat, as declared on the MCS-150. source
Cargo classes (MCS-150)	Chemicals, General freight, Intermodal containers, Building materials, Construction, Machinery, large objects, Metal: sheets, coils, rolls, Grain, feed, hay, Refrigerated food, Paper products, Meat, Other cargo Cargo the carrier declared it hauls on its latest MCS-150 (FMCSA's fixed cargo list). source
Driver count	100–499 drivers Total drivers, banded. source
Last MCS-150 update	Feb 10, 2026 When the carrier last updated its registration (required at least every two years). source
Out-of-service share (24 months)	10% to 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)	423 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)	14 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
USDOT number	44035 source
MC docket	MC-144606 source
Operating authority	Active for-hire authority (MC) source
Other cargo (as described)	Scrap Metal source
Power units	259 source
Tractors (owned or leased)	259 source
Trailers (owned or leased)	3,000 source
Drivers	231 source
CDL drivers	231 source
Miles reported (MCS-150)	23,801,483 miles source
Mileage year	2025 source
Also hauls its own freight	No source
Safety rating date	Oct 13, 2010 source
USDOT registered since	Jun 1, 1974 source
Business type	Corporation source
Inspections with an out-of-service order (24 months)	47 source
Hazmat inspections (24 months)	22 source
Hazmat out-of-service orders (24 months)	0 source
Deaths in those crashes	0 source
Injuries in those crashes	4 source
Crashes with a hazmat release (24 months)	0 source

Source event history

Source dates and first observation are different.

Feb 10, 2026: Filed an MCS-150 update Official source
Oct 13, 2010: Rated by FMCSA Official source
Jun 1, 1974: Registered with FMCSA Official source

Dates on this record

Source updated	Oct 22, 2026 (FMCSA census rows last updated (portal metadata) (the whole dataset, not this record))
Collected	Oct 22, 2026, 10:22 PM ET (the last successful check of the source that included this record)
Effective	Filed an MCS-150 update: Feb 10, 2026; Rated by FMCSA: Oct 13, 2010; Registered with FMCSA: Jun 1, 1974 (when the source says each fact took effect)
Retired	Not retired: the source is still maintained (whether the dataset is still maintained)

In Arizona

115 hazmat carriers in the dataset are in Arizona; 18 have profiles on this site. Hazmat carriers in Arizona

FMCSA safety rating (all 115 here): Conditional 2 (2%) · Not rated 69 (60%) · Satisfactory 44 (38%)

Rating age (all 115 here): Rating over 10 years old 36 (31%) · Not rated 69 (60%) · Rating 5–10 years old 6 (5%) · Rated within the last 5 years 4 (3%)

Fleet size (all 115 in this group): 25–99 power units (49) · 10–24 power units (45) · 100–499 power units (16) · 500+ power units (5)

Cargo classes (MCS-150) (all 115 in this group; a record can count under several values): General freight (89) · Machinery, large objects (53) · Liquids / gases (50) · Motor vehicles (49) · Building materials (45) · Construction (45) · 24 other values (400)

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Browse related lists

USDOT number: The registration number every interstate (and many intrastate) commercial carrier holds.

MCS-150: The registration form carriers file with FMCSA and must update at least every two years; fleet, drivers, cargo and the hazmat flag on this site come from it, as the carrier declared them.

Safety rating: FMCSA's result after an on-site compliance review: Satisfactory, Conditional or Unsatisfactory. A rating is not refreshed unless FMCSA reviews the carrier again, so many are years old; each profile gives the review date. Most carriers have never been reviewed and are not rated; that is not a bad mark.

Power units: Trucks and tractors that pull or carry freight.

Reportable crash: A crash involving the carrier's vehicle with a death, an injury treated away from the scene or a vehicle towed away. FMCSA records it whoever was at fault.

Cargo classes: Self-declared on the MCS-150 from FMCSA's fixed list. Some carriers tick most of the list, so a long list means 'declared', not 'specialises in'; the hazmat flag does not say which hazardous materials.

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Something wrong or out of date? Suggest a correction. Source record ID 44035.