Mission
THE MISSION OF THE ORGANIZATION IS THE PRESERVATION, RESEARCH, AND INTERPRETATION OF THE MAMMOTH SITE OF HOT SPRINGS, SOUTH DAKOTA, AND DEVELOPMENT OF A BROAD UNDERSTANDING OF THE LATE ICE AGE RECORD ACROSS A GLOBAL FRAMEWORK.
Public Charity
MAMMOTH SITE OF HOT SPRINGS
MAMMOTH SITE OF HOT SPRINGS, of HOT SPRINGS, SD, is a Public Charity tracked in Imperigo's IRS 990 database. The 2025 filing shows $1.6M in revenue, $1.7M in expenses, $6.5M in total assets. 16 publicly reported grants to this organization, totaling roughly $487K, appear in IRS filings.
EIN: 460337824
HOT SPRINGS, SD
Latest filing: 2025
Total Revenue$1.6M
Total Expenses$1.7M
Total Assets$6.5M
Grant Records16
Funding Total$487K
Filing Years2020–2025
Sample Grants Received
COMMUNITY WELFARE
$8,000
COMMUNITY WELFARE
$38,500
Community welfare and betterment
$16,000
COMMUNITY WELFARE
$19,650
COMMUNITY WELFARE
$30,000
Showing up to 5 of 16 total records — full history available with membership.
Officers & Directors
MEMBER
Amy Spears
MEMBER
Anna Merrill
SECRETARY
Caleb Arceneaux
MEMBER
Dr Mike Leite
MEMBER
Greg Gunwall
LEGAL ADVISO
Jane Farrell
Officer compensation and complete director data available with membership.
Top Grant Purposes
Financial Trends
| Year | Revenue | Expenses | Assets |
|---|---|---|---|
| 2025 | $1.6M | $1.7M | $6.5M |
| 2023 | $1.8M | $1.8M | $6.0M |
| 2022 | $1.8M | $1.9M | $5.9M |
| 2021 | $4.9M | $1.6M | $6.3M |
| 2020 | $995K | $1.4M | $3.8M |
Between 2020 and 2025, reported annual revenue grew from $995K to $1.6M (+63%), with total assets most recently reported at $6.5M.
Interactive year-over-year charts and full filing details available with membership.