Key Takeaway
Carderock Quarries is a active surface mine producing Stone, located in Bethesda, Montgomery County, MD. It has 96 violations on record (12 S&S) and $13K in proposed penalties. Operated by Tri-State Stone & Building Supply Inc..
Carderock Quarries
Operator: Tri-State Stone & Building Supply Inc.
Controller: Porto Family Dynasty Trust 1; Brian A Porto et al
Location: Bethesda, Montgomery County, MD
Employees: 22
Recent Violations
View all 96 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 11/05/2025 | 56.14100(b) | Non-S&S | ModNegligence | $151 |
| 09/30/2025 | 62.120 | Non-S&S | ModNegligence | $151 |
| 07/23/2024 | 56.15004 | S&S | LowNegligence | $147 |
| 08/01/2023 | 56.18010 | Non-S&S | LowNegligence | $143 |
| 08/01/2023 | 56.12004 | Non-S&S | LowNegligence | $143 |
| 08/01/2023 | 56.14100(b) | Non-S&S | LowNegligence | $143 |
| 02/07/2023 | 56.12032 | Non-S&S | ModNegligence | $143 |
| 02/07/2023 | 46.9(c)(4) | Non-S&S | ModNegligence | $143 |
| 03/08/2022 | 56.4101 | Non-S&S | LowNegligence | $133 |
| 03/08/2022 | 56.15004 | Non-S&S | LowNegligence | $133 |
| 09/08/2021 | 56.4101 | Non-S&S | ModNegligence | $125 |
| 09/08/2021 | 56.16005 | Non-S&S | LowNegligence | $125 |
| 09/08/2021 | 56.12018 | Non-S&S | ModNegligence | $125 |
| 02/17/2021 | 56.4104(b) | Non-S&S | LowNegligence | $125 |
| 02/17/2021 | 56.16005 | Non-S&S | ModNegligence | $125 |
| 08/29/2020 | 56.12028 | Non-S&S | LowNegligence | $123 |
| 12/03/2019 | 56.14100(b) | Non-S&S | ModNegligence | $123 |
| 12/03/2019 | 56.14101(a)(2) | Non-S&S | ModNegligence | $412 |
| 12/03/2019 | 56.4201(a)(1) | Non-S&S | ModNegligence | $123 |
| 06/04/2019 | 56.12028 | Non-S&S | LowNegligence | $121 |
Accidents & Injuries
View all 7 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 08/06/2013 | HANDTOOLS (NONPOWERED) | DAYS AWAY FROM WORK ONLY | 11d lost |
| 08/25/2006 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | 200d lost |
| 08/24/2006 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 10d restricted |
| 08/08/2006 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 7d restricted |
| 04/21/2005 | FALL OF FACE/RIB/PILLAR/SIDE/HIGHWALL | DYS AWY FRM WRK & RESTRCTD ACT | 67d lost, 11d restricted |
| 06/23/2000 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | 18d lost |
| 05/17/2000 | HANDTOOLS (NONPOWERED) | DYS AWY FRM WRK & RESTRCTD ACT | 9d lost, 32d restricted |
Inspections
View all 59 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 11/04/2025 | 11/06/2025 | 16.00 | 1 |
| 09/29/2025 | 09/30/2025 | 24.00 | 1 |
| 06/29/2025 | 07/01/2025 | 31.00 | 1 |
| 01/15/2025 | 01/17/2025 | 18.50 | 1 |
| 07/23/2024 | 07/23/2024 | 10.00 | 1 |
| 12/11/2023 | 12/14/2023 | 19.75 | 1 |
| 08/01/2023 | 08/01/2023 | 12.50 | 1 |
| 02/06/2023 | 02/07/2023 | 13.00 | 1 |
| 09/01/2022 | 09/08/2022 | 24.00 | 1 |
| 03/07/2022 | 03/08/2022 | 12.50 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Carderock Quarries have?
Carderock Quarries has 96 MSHA violations on record, of which 12 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $13K.
What type of mine is Carderock Quarries?
Carderock Quarries is a Surface mine producing Stone, located in Bethesda, Montgomery County, MD. It currently has 22 employees.
Has anyone been injured or killed at Carderock Quarries?
According to MSHA records, Carderock Quarries has 7 reported accident/injury records and 0 fatalities on file.
Who operates Carderock Quarries?
Carderock Quarries is operated by Tri-State Stone & Building Supply Inc. and controlled by Porto Family Dynasty Trust 1; Brian A Porto et al. MSHA Mine ID: 1800404.