Updated Oct 30, 2026

Knife River Corporation - Mountain West

As of Oct 30, 2026, Knife River Corporation - Mountain West in Boise, Idaho reports 374 power units and 275 drivers on its MCS-150, not rated by FMCSA.

5450 W Gowen Rd, Boise, Idaho 83709 (208) 362-6152

Verified Oct 30, 2026 against FMCSA Company Census File (data.transportation.gov)

Knife River Corporation - Mountain West (USDOT 3111936, MC-83161), doing business as Knife River, is an active motor carrier based in Boise, Idaho 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: 374 power units and 275 drivers (0 with CDLs). Power units count straight trucks as well as tractors, so they can exceed the tractor count. It reported 6,167,300 miles for 2024 on its MCS-150. Cargo classes declared: chemicals, liquids / gases, general freight, building materials, construction, machinery, large objects, metal: sheets, coils, rolls, utilities, motor vehicles, other cargo (other: Construction). 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 21 roadside inspections, 8 of them (38.1%) with an out-of-service order; 6 reportable crashes (0 deaths, 5 injuries); a crash on record does not by itself mean the carrier caused it. Registration (MCS-150) last updated June 23, 2025.

Key facts

Fleet size	100–499 power units Power units, banded. source, unchanged since Oct 25, 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 25, 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 Yes means the MCS-150 was last updated more than two years ago, past FMCSA's two-year update requirement; fleet, driver and cargo figures may then be out of date. source, unchanged since Oct 25, 2026
Operation	Interstate Interstate, intrastate hazmat or intrastate non-hazmat, as declared on the MCS-150. source, unchanged since Oct 25, 2026
Cargo classes (MCS-150)	Chemicals, Liquids / gases, General freight, Building materials, Construction, Machinery, large objects, Metal: sheets, coils, rolls, Utilities, Motor vehicles, Other cargo Cargo the carrier declared it hauls on its latest MCS-150 (FMCSA's fixed cargo list). source, unchanged since Oct 25, 2026
Driver count	100–499 drivers Total drivers, banded. source, unchanged since Oct 25, 2026
Last MCS-150 update	Jun 23, 2025 When the carrier last updated its registration (required at least every two years). source, unchanged since Oct 25, 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, unchanged since Oct 25, 2026
Roadside inspections (24 months)	21 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, unchanged since Oct 25, 2026
Reportable crashes (24 months)	6 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, unchanged since Oct 25, 2026
Doing business as	Knife River source, unchanged since Oct 25, 2026
USDOT number	3111936 source, unchanged since Oct 25, 2026
MC docket	MC-83161 source, unchanged since Oct 25, 2026
Operating authority	Active for-hire authority (MC) source, unchanged since Oct 25, 2026
Other cargo (as described)	Construction source, unchanged since Oct 25, 2026
Power units	374 source, unchanged since Oct 25, 2026
Tractors (owned or leased)	44 source, unchanged since Oct 25, 2026
Trailers (owned or leased)	305 source, unchanged since Oct 25, 2026
Drivers	275 source, unchanged since Oct 25, 2026
CDL drivers	0 source, unchanged since Oct 25, 2026
Miles reported (MCS-150)	6,167,300 miles source, unchanged since Oct 25, 2026
Mileage year	2024 source, unchanged since Oct 25, 2026
Also hauls its own freight	Yes source, unchanged since Oct 25, 2026
FMCSA census record date (ADD_DATE)	Mar 20, 2018 source, unchanged since Oct 25, 2026
Inspections with an out-of-service order (24 months)	8 source, unchanged since Oct 25, 2026
Hazmat inspections (24 months)	0 source, unchanged since Oct 25, 2026
Hazmat out-of-service orders (24 months)	0 source, unchanged since Oct 25, 2026
Deaths in those crashes	0 source, unchanged since Oct 25, 2026
Injuries in those crashes	5 source, unchanged since Oct 25, 2026
Crashes with a hazmat release (24 months)	0 source, unchanged since Oct 25, 2026

Source event history

Source dates and first observation are different.

Jun 23, 2025: Filed an MCS-150 update Official source
Mar 20, 2018: FMCSA census record date (not the carrier's first registration) Official source

Dates on this record

Source updated	Oct 30, 2026 (FMCSA census rows last updated (portal metadata) (the whole dataset, not this record))
Collected	Oct 30, 2026, 12:46 PM ET (the last successful check of the source that included this record)
Effective	Filed an MCS-150 update: Jun 23, 2025; FMCSA census record date (not the carrier's first registration): Mar 20, 2018 (when the source says each fact took effect)
Retired	Not retired: the source is still maintained (whether the dataset is still maintained)

In Idaho

93 hazmat carriers in the dataset are in Idaho; 14 have profiles on this site. Hazmat carriers in Idaho

FMCSA safety rating (all 93 here): Conditional 4 (4%) · Not rated 51 (55%) · Satisfactory 38 (41%)

Rating age (all 93 here): Rating over 10 years old 32 (34%) · Not rated 51 (55%) · Rated within the last 5 years 6 (6%) · Rating 5–10 years old 4 (4%)

Fleet size (all 93 in this group): 10–24 power units (54) · 25–99 power units (25) · 100–499 power units (12) · 500+ power units (2)

Cargo classes (MCS-150) (all 93 in this group; a record can count under several values): General freight (64) · Other cargo (57) · Machinery, large objects (56) · Building materials (45) · Construction (45) · Liquids / gases (37) · 24 other values (381)

Similar hazmat carriers

Chosen by the values they share with this one, rarer values counting more; ties go to the same city, then the nearest ZIP code, then this site's order (largest fleets first (power units on the latest MCS-150)).

Doxa LLC · Austin · FMCSA safety rating: Not rated
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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 3111936.