Mammoth Mountain Ski Area, LLC

Mammoth Mountain Ski Area

10001 Minaret Road, Mammoth Lakes, CA 93546
Skiing Facilities (NAICS 713920)

DART 7.84 121 recordable cases · 1,690 avg employees · 1,837,227 hours worked

This establishment vs. the industry

The DART rate at this establishment is 1.4× the industry median.

This establishment: 7.84
Industry median (Ski resorts without accommodations, n=55): 5.57

Reported injury and illness, 2024

Fatalities0 Days-away-from-work cases49 Restricted-duty / transferred cases23 Other recordable cases49 Total recordable cases121 Days lost to injury1,668

Injury rates (per 100 FTE-year, OSHA standard)

DART rate7.84 (days away + restricted/transferred) DAFW rate5.33 (days away from work only) Total recordable rate (TRIR)13.17 (all OSHA-recordable cases) Annual average employees1,690 Total hours worked1,837,227
What these numbers mean. An OSHA-recordable case is a work-related injury or illness that resulted in death, days away from work, restricted work, transfer to another job, medical treatment beyond first aid, loss of consciousness, or significant injury diagnosed by a physician. DART rate is the OSHA-standard incidence measure — calculate it as (cases with days away + restricted/transferred) × 200,000 / hours worked. The 200,000 hours normalizes to 100 full-time-equivalent workers over a year. National average DART across all industries is around 1.7; high-risk industries (skilled nursing, warehousing, courier) routinely exceed 5.

Source: OSHA ITA 300A Summary Data, calendar year 2024 filings (downloaded 2026-05-23).

OSHA Lookup · workplace-injury data from OSHA ITA 300A 2024 · About / methodology