Nonprofit · EIN 46-0258947
MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS
Tax-exempt · RAPID CITY, SD 57701
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $3,289,509 | $2,962,230 | $327,279 | $21,739,805 | $88,416 | $21,651,389 |
| December 31, 2024 | 990 | $3,123,880 | $2,755,474 | $368,406 | $20,657,217 | $150,747 | $20,506,470 |
| December 31, 2023 | 990 | $2,999,799 | $2,384,540 | $615,259 | $19,868,568 | $219,175 | $19,649,393 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $1,061,709
- of which government grants
- $253,000
- Membership dues
- $6,145
- Program service revenue
- $0
- Investment income
- $1,335,345
- Net rental income
- $3,825
- Net gain from sales of assets
- $824,975
- Net income from fundraising events
- -$43,382
- Net income from sales of inventory
- $931,014
- Other revenue
- $892,455
Expenses
- Grants and similar amounts paid
- $1,149,811
- Compensation of officers, directors and key employees
- $215,586
- Other salaries and wages
- $653,183
- Salaries, compensation and benefits (total)
- $1,029,053
- Professional fundraising fees
- $63,720
- Legal fees
- $127
- Accounting fees
- $26,231
- Occupancy
- $31,402
- Travel
- $34,346
- Depreciation
- $114,069
- Program services (functional)
- $2,100,816
- Management and general (functional)
- $560,950
- Fundraising (functional)
- $300,464
Balance sheet and other
- Total assets, start of year
- $20,657,217
- Total assets, end of year
- $21,739,805
- Total liabilities, end of year
- $88,416
- Net assets, end of year
- $21,651,389
- Land, buildings and equipment
- $1,762,574
- Publicly traded securities
- $17,259,375
- Net assets without donor restrictions
- $21,048,757
- Net assets with donor restrictions
- $602,632
- Gross receipts
- $8,043,493
- Employees
- 56
- Volunteers
- 0
- Year formed
- 1930
- State of legal domicile
- SD
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Diana Nielsen | CEO Officer | 40 | $127,892 |
| Stephanie Helms | Director of Philanthropy Highest-paid employee | 40 | $107,510 |
| Jackie Spreizer | Director of Finance Officer | 40 | $81,898 |
| Eileen Rossow | President Trustee or director, Officer | 5 | $0 |
| Marnie Herrmann | Past President Trustee or director, Officer | 5 | $0 |
| Rich Kinzley | Vice President Trustee or director, Officer | 5 | $0 |
| Dan Wenk | Secretary Trustee or director, Officer | 5 | $0 |
| Anthony Cleberg | Treasurer Trustee or director, Officer | 5 | $0 |
| Aaron Galloway | Board Member Trustee or director | 3 | $0 |
| Jeffrey Connolly | Board Member Trustee or director | 3 | $0 |
| Brian Hagg | Board Member Trustee or director | 3 | $0 |
| John Rozell | Board Member Trustee or director | 3 | $0 |
| Rollie Noem | Board Member Trustee or director | 3 | $0 |
| Toni Logar | Board Member Trustee or director | 3 | $0 |
| Andy Perucci | Board Member Trustee or director | 3 | $0 |
990 for the year ended December 31, 2024: 16 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Diana Nielsen | CEO Trustee or director | 40 | $124,245 |
| Stephanie Helms | Director of Philanthropy Highest-paid employee | 40 | $103,677 |
| Jackie Spreizer | Director of Finance Trustee or director | 40 | $78,014 |
| Marnie Herrmann | President Trustee or director, Officer | 5 | $0 |
| Aaron Galloway | Past President Trustee or director, Officer | 5 | $0 |
| Eileen Rossow | Vice President Trustee or director, Officer | 5 | $0 |
| Rich Kinzley | Secretary Trustee or director, Officer | 5 | $0 |
| Anthony Cleberg | Treasurer Trustee or director, Officer | 5 | $0 |
| Jeffrey Connolly | Board Member Trustee or director | 3 | $0 |
| Michael Diedrich | Board Member Trustee or director | 3 | $0 |
| Brian Hagg | Board Member Trustee or director | 3 | $0 |
| John Rozell | Board Member Trustee or director | 3 | $0 |
| Rollie Noem | Board Member Trustee or director | 3 | $0 |
| Toni Logar | Board Member Trustee or director | 3 | $0 |
| Dan Wenk | Board Member Trustee or director | 3 | $0 |
| Andy Perucci | Board Member Trustee or director | 3 | $0 |
990 for the year ended December 31, 2023: 14 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Diana Nielsen | CEO Trustee or director, Key employee | 40 | $123,738 |
| Jackie Spreizer | Director of Finance Trustee or director, Key employee | 40 | $76,182 |
| Marnie Herrmann | President Trustee or director, Officer | 5 | $0 |
| Aaron Galloway | Past President Trustee or director, Officer | 5 | $0 |
| Eileen Rossow | Vice President Trustee or director, Officer | 5 | $0 |
| Rich Kinzley | Secretary Trustee or director, Officer | 5 | $0 |
| Anthony Cleberg | Treasurer Trustee or director, Officer | 5 | $0 |
| Jeffrey Connolly | Board Member Trustee or director | 3 | $0 |
| Michael Diedrich | Board Member Trustee or director | 3 | $0 |
| Brian Hagg | Board Member Trustee or director | 3 | $0 |
| Gary Brown | Board Member Trustee or director | 3 | $0 |
| John Rozell | Board Member Trustee or director | 3 | $0 |
| Rollie Noem | Board Member Trustee or director | 3 | $0 |
| Toni Logar | Board Member Trustee or director | 3 | $0 |
Address and contacts
- Address (IRS master file)
- 830 MAIN ST, RAPID CITY, SD 57701-2638
- In care of
- % DIANA NIELSEN
- Principal officer (990 for 2025)
- Diana Nielsen, 830 MAIN ST, RAPID CITY, SD 577012638
- Signed the 990
- Diana Nielsen, CEO
- Phone
- (605) 341-8883
- Website
- www.mountrushmoresociety.com
Mission
See Schedule O.
Program accomplishments
- In keeping with its mission to Protect Preserve and Promote Mount Rushmore National Memorial the Society provides funding to enhance the visitor experience and provide education and interpretive programming to the public about Mount Rushmore in partnership with the National Park Service. Through the operation of the Mount Rushmore Bookstores fundraising and community outreach and engagement the Society provides funding and support for the following projects: Mount Rushmore interpretive ranger intern program school bus parking and transportation scholarships which allow children from local schools to attend educational opportunities at the Memorial historical and cultural performances exhibits and demonstrations Junior Ranger program and supplies enhancement of ranger visitor information stations development of original publications to be sold at the Memorial hosting of local community outreach events publication of materials for local visitor centers and providing interpretive program supplies library acquisitions and meeting space for park service employee education.Expenses $2,100,816 · grants $1,149,811
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | 990 on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990 on file |
IRS record
- EIN
- 46-0258947
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (170(b)(1)(A)(vi))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 1944
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Assets (IRS master file)
- $21,739,805
- Income (IRS master file)
- $8,043,493
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $3,289,509 | $2,962,230 | $21,739,805 | IRS |
| 990-T | December 2025 | – | – | – | IRS |
| 990 | December 2024 | $3,123,880 | $2,755,474 | $20,657,217 | IRS |
| 990-T | December 2024 | – | – | – | IRS |
| 990 | December 2023 | $2,999,799 | $2,384,540 | $19,868,568 | XML |
| 990-T | December 2023 | – | – | – | IRS |
| 990 | December 2022 | $2,119,121 | $3,542,423 | $17,948,059 | IRS |
| 990-T | December 2022 | – | – | – | IRS |
| 990 | December 2021 | – | – | – | IRS |
| 990-T | December 2021 | – | – | – | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990-T | December 2020 | – | – | – | IRS |
| 990 | December 2019 | – | – | – | IRS |
| 990 | December 2018 | – | – | – | IRS |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 46-0258947).
Questions about MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS
- What is the EIN of MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS?
- The employer identification number (EIN) of MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS is 46-0258947.
- Is MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1944.
- Are donations to MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS due?
- The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2025.
- Who is the principal officer of MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS?
- The 990 for the year ended December 31, 2025 names Diana Nielsen.
- Who are the officers and directors of MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS?
- The 990 for the year ended December 31, 2025 lists 15 people; 3 received compensation from the organization, the highest $127,892 (Diana Nielsen, CEO).
- How much revenue does MOUNT RUSHMORE NATIONAL MEMORIAL SOCIETY OF BLACK HILLS have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $3,289,509, expenses of $2,962,230 and total assets of $21,739,805 at year end.
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