Key Takeaway
Heidelberg Materials High Rock Quarry is a active surface mine producing Stone, located in Monroe, Snohomish County, WA. It has 258 violations on record (33 S&S) and $57K in proposed penalties. Operated by HM Pacific Northwest, Inc..
Heidelberg Materials High Rock Quarry
Operator: HM Pacific Northwest, Inc.
Controller: Heidelberg Materials AG
Location: Monroe, Snohomish County, WA
Employees: 32
Recent Violations
View all 258 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 01/15/2026 | 56.12004 | Non-S&S | ModNegligence | $0 |
| 01/15/2026 | 56.12018 | Non-S&S | ModNegligence | $0 |
| 01/15/2026 | 56.12002 | Non-S&S | LowNegligence | $0 |
| 01/15/2026 | 56.11001 | Non-S&S | LowNegligence | $0 |
| 01/14/2026 | 56.23003(b) | Non-S&S | ModNegligence | $0 |
| 01/14/2026 | 46.5(a) | S&S | LowNegligence | $0 |
| 01/13/2026 | 56.4402 | Non-S&S | ModNegligence | $0 |
| 01/13/2026 | 56.12004 | Non-S&S | ModNegligence | $0 |
| 01/13/2026 | 56.11001 | S&S | ModNegligence | $0 |
| 10/30/2025 | 56.6306(e) | S&S | HighNegligence | $1,968 |
| 07/10/2025 | 56.3200 | S&S | ModNegligence | $3,184 |
| 07/10/2025 | 56.20003(a) | S&S | ModNegligence | $959 |
| 07/10/2025 | 56.12018 | Non-S&S | ModNegligence | $193 |
| 07/10/2025 | 56.12018 | Non-S&S | ModNegligence | $193 |
| 07/09/2025 | 56.11002 | Non-S&S | ModNegligence | $193 |
| 07/09/2025 | 56.11027 | Non-S&S | ModNegligence | $193 |
| 07/09/2025 | 56.11027 | Non-S&S | ModNegligence | $193 |
| 07/09/2025 | 56.14112(a)(1) | Non-S&S | ModNegligence | $288 |
| 07/09/2025 | 56.14132(a) | Non-S&S | ModNegligence | $642 |
| 07/09/2025 | 56.11027 | Non-S&S | ModNegligence | $193 |
Accidents & Injuries
View all 38 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 11/07/2025 | MACHINERY | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 05/03/2021 | MACHINERY | DAYS AWAY FROM WORK ONLY | 284d lost |
| 02/04/2021 | HANDTOOLS (NONPOWERED) | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 04/02/2019 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 03/22/2019 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 10d restricted |
| 04/23/2018 | HANDLING OF MATERIALS | PERM TOT OR PERM PRTL DISABLTY | None |
| 10/27/2017 | HANDTOOLS (NONPOWERED) | DAYS RESTRICTED ACTIVITY ONLY | 2d restricted |
| 08/26/2016 | SLIP OR FALL OF PERSON | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 06/16/2015 | SLIP OR FALL OF PERSON | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 04/24/2015 | POWERED HAULAGE | NO DYS AWY FRM WRK,NO RSTR ACT | None |
Inspections
View all 68 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 01/26/2026 | 01/26/2026 | 6.50 | 1 |
| 01/12/2026 | 01/16/2026 | 39.00 | 1 |
| 10/28/2025 | 11/04/2025 | 17.00 | 1 |
| 09/02/2025 | 09/03/2025 | 16.00 | 1 |
| 07/08/2025 | 07/15/2025 | 46.75 | 1 |
| 12/13/2024 | 12/16/2024 | 13.00 | 1 |
| 11/14/2024 | 11/26/2024 | 58.00 | 1 |
| 05/28/2024 | 05/30/2024 | 23.00 | 1 |
| 03/07/2024 | 03/13/2024 | 24.50 | 1 |
| 08/09/2023 | 08/09/2023 | 0.75 | 1 |
Mine Details
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Frequently Asked Questions
How many MSHA violations does Heidelberg Materials High Rock Quarry have?
Heidelberg Materials High Rock Quarry has 258 MSHA violations on record, of which 33 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $57K.
What type of mine is Heidelberg Materials High Rock Quarry?
Heidelberg Materials High Rock Quarry is a Surface mine producing Stone, located in Monroe, Snohomish County, WA. It currently has 32 employees.
Has anyone been injured or killed at Heidelberg Materials High Rock Quarry?
According to MSHA records, Heidelberg Materials High Rock Quarry has 38 reported accident/injury records and 0 fatalities on file.
Who operates Heidelberg Materials High Rock Quarry?
Heidelberg Materials High Rock Quarry is operated by HM Pacific Northwest, Inc. and controlled by Heidelberg Materials AG. MSHA Mine ID: 4501999.