GREAT SOUTHWESTERN CONSTRUCTION INC
CASTLE ROCK, CO
04/30/1987
314
Power Units
357
Drivers
Current
as of today
Active · 314 power units · 357 drivers · Castle Rock, CO
2025
Jun 25, 2025
MCS-150 biennial update filed
Reported mileage: 4,462,006 (2024)
Reported power units: 280 → 314
Reported drivers: 300 → 357
Reported trailers: 313
2024
Sep 18, 2024
MCS-150 biennial update filed
Reported mileage: 4,612,629 (2022)
Reported power units: 280
Reported drivers: 252 → 300
2023
May 1, 2023
MCS-150 biennial update filed
Reported mileage: 4,612,629 (2022)
Reported power units: 209 → 280
Reported drivers: 260 → 252
2022
Aug 11, 2022
MCS-150 biennial update filed
Reported mileage: 2,296,719 (2020)
Reported power units: 209
Reported drivers: 260
2021
May 13, 2021
MCS-150 biennial update filed
Reported mileage: 2,296,719 (2020)
Reported power units: 130 → 209
Reported drivers: 256 → 260
2019
May 29, 2019
MCS-150 biennial update filed
Reported mileage: 2,107,541 (2018)
Reported power units: 130
Reported drivers: 256
1998
Jul 13, 1998
Safety rating: Conditional
1987
Apr 30, 1987
DOT registered
Company registered with the FMCSA.