Spearfish, SD
DOT 4136872MC 17206632 trucks3 drivers
Green: NO RED FLAGS IN FMCSA RECORDS
Active authority and insurance on file. Still confirm every load by calling the phone number on file.
Authority
Active Authority
Legally allowed to pick up and haul interstate freight.
MC active for 1 year, 6 months (since April 18, 2025)
Insurance
Active Liability Insurance ($1,000,000 Covered)
Pays for damage or injuries if this truck causes a crash. It's on file with FMCSA.
Paperwork (MCS-150)
Paperwork Status: Up to Date
Last filed November 4, 2026. Next update due by February 2027.
Safety Rating
Not Checked
Not in this record. Run a live check for FMCSA's current rating.
| Form | Class | Insurance carrier | Policy # | Effective |
|---|---|---|---|---|
| BMC-91X | Primary | Great West Casualty Co | GRT53684A | Mar 25, 2026 |
| Coverage | On record with FMCSA |
|---|---|
| Liability (BIPD) required | $750,000 |
| Liability (BIPD) on file | $1,000,000 |
| Cargo insurance | Not on file |
FMCSA insurance file as of November 15, 2026.
Filings are the active or pending insurance policies FMCSA lists for this company; our copy refreshes nightly. Coverage amounts are not shown per policy.
From FMCSA's authority history (its current Motus system, plus the older L&I history it froze on May 14, 2026). "First granted" is the earliest grant on record; "on record since" is the earliest action FMCSA has when the grant itself is older than its electronic records. "Active since" is the latest grant or reinstatement, so a lapse that FMCSA reinstated restarts the clock.
From FMCSA's Safety Measurement System files, October 2024 to October 2026. Crash counts include crashes the carrier didn't cause. Out-of-service rates use only inspections that checked the driver or the vehicle.
Every roadside inspection in FMCSA's file for USDOT #4136872: when, where, and which vehicles (type, make, VIN) the inspector recorded.
THC compares FMCSA's files every night and keeps what changed. Tracked since October 30, 2026, last compared November 15, 2026.
Noticed by THC November 8, 2026 (changed after our November 7, 2026 copy)
Number of drivers reported changed
1 → 3
Why it may matter: Fleet size shows roughly how big the operation is.
What it doesn't show: These are the company's own MCS-150 numbers, not a count FMCSA checked.
Next step: Nothing needed unless other details changed too.
Source: FMCSA Company Census File (data.transportation.gov).
Noticed by THC November 8, 2026 (changed after our November 7, 2026 copy)
Number of trucks reported changed
1 → 2
Why it may matter: Fleet size shows roughly how big the operation is.
What it doesn't show: These are the company's own MCS-150 numbers, not a count FMCSA checked.
Next step: Nothing needed unless other details changed too.
Source: FMCSA Company Census File (data.transportation.gov).
Noticed by THC November 8, 2026 (changed after our November 7, 2026 copy)
MCS-150 updated
FMCSA's file dates the update November 4, 2026
Why it may matter: Carriers must update the MCS-150 every two years. A fresh update means the fleet and contact details are recent.
What it doesn't show: The MCS-150 is filled in by the company itself; FMCSA doesn't check the numbers.
Next step: Nothing needed unless other details changed too.
Source: FMCSA Company Census File (data.transportation.gov).
Dates are when THC noticed the change in FMCSA's files, not when it happened, unless FMCSA's file gives the date. FMCSA's files can lag behind FMCSA's own systems. Check this record on FMCSA SAFER · Daily FMCSA change reports
Yes. USDOT 4136872 (Diamond Building Products LLC) is active, with active for-hire carrier operating authority under MC 1720663 (FMCSA authority file, November 15, 2026).
FMCSA's authority history shows Diamond Building Products LLC's common carrier authority was first granted on April 18, 2025 and is active.
Our daily record doesn't include Diamond Building Products LLC's safety rating. Run a free live check to see FMCSA's current rating. Most carriers are "Not Rated", which is normal: it means FMCSA has never done a full audit.
In FMCSA's safety data for October 2024 to October 2026, Diamond Building Products LLC had 2 roadside inspections. It had no reportable crashes.
Yes, it looks up to date. FMCSA's records show it was last filed November 4, 2026. The next update is due by February 28, 2027.
Yes. FMCSA's records show liability (BIPD) insurance on file for Diamond Building Products LLC ($1,000,000 on file). Ask for a certificate of insurance naming you before the load.
From public FMCSA records (the Company Census File, FMCSA's daily authority and insurance file and its monthly Safety Measurement System inspection and crash files). Trucking Help Center is not FMCSA and is not affiliated with this company. Records can change daily: run a live check, and confirm every load by calling the phone number on file. Is this your company and something looks wrong? Update your MCS-150 with FMCSA; our copy refreshes nightly.
Green: NO RED FLAGS IN FMCSA RECORDS
Active authority and insurance on file. Still confirm every load by calling the phone number on file.
Authority
Active Authority
Legally allowed to pick up and haul interstate freight.
MC active for 1 year, 6 months (since April 18, 2025)
Insurance
Active Liability Insurance ($1,000,000 Covered)
Pays for damage or injuries if this truck causes a crash. It's on file with FMCSA.
Paperwork (MCS-150)
Paperwork Status: Up to Date
Last filed November 4, 2026. Next update due by February 2027.
Safety Rating
Not Checked
Not in this record. Run a live check for FMCSA's current rating.
