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

Active Surface Stone

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

96
Violations
12
S&S Violations
7
Accidents
$13K
Penalties

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

MSHA Mine ID1800404
Mine TypeSurface
StatusActive
CommodityStone
SIC DescriptionCrushed, Broken Stone NEC
Employees22
Days/Week5.0
Hours/Shift8.0
Coordinates39.0458330, -76.6413890
Nearest TownBethesda

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.