Harsens Island-St Clair Flats Historical Society
Public records show a registered, tax-exempt organization in good standing.
What it says it does
THE HARSENS ISLAND/ST. CLAIR FLATS HISTORICAL SOCIETYS MISSION IS TO COLLECT, PROTECT, PRESERVE AND SHARE WITH THE PUBLIC THE UNIQUE HISTORICAL ARTIFACTS AND INFORMATION THAT REPRESENTS THE DIVERSE CULTURAL COMPOSITION OF THE PEOPLE THAT OCCUPIED THE AREA OF THE ST. CLAIR RIVER DELTA THAT IS HARSENS ISLAND AND THE ST. CLAIR FLATS.
- Income
- $24,459
- Spending
- $30,449
- Reserves
- 69.7 months of spending
- Largest source of income
- fees for its services, 99%
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Financial health
We do not score finances when yearly spending is very small or the return has too little detail. The ratios stop meaning much at that size.
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Governance
This organization files the short tax form, which does not ask about boards, policies or audits. That is normal for a small charity and is not a mark against it.
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Impact evidence
Describes programs. Its tax return describes what it does but we have found no measurable results in it.
Programs described in its return (1)
- $30,449 spent. THE HARSENS ISLAND ST. CLAIR FLATS HISTORICAL SOCIETY OPENED THE MUSEUM OVER THE MEMORIAL DAY WEEKEND AGAIN IN 2025, WITH MANY VISITORS AND SPECIAL GROUPS VISITING THROUGHOUT THE SUMMER. WE MAINTAINED OUR NORMAL WEEK-END HOURS MAY-SEPTEMBER. THE SPEAKER SERIES AGAIN WAS WELL ATTENDED, WITH SPEAKERS DISCUSSING LOCAL SHIPWRECKS, AND ONE OF OUR BOARD MEMBERS SHARED HER THREE FIRES PRESENTATION (HISTORY OF NEIGHBORING WALPOLE ISLAND) DESIGNED FOR HER 3RD GRADERS BUT WAS WELL ATTENDED BY MANY WHO WERE YOUNG AT HEART. THE MUSEUM OPENED FOR 3 ANNUAL EVENTS AND FUNDRAISERS AFTER SEPTEMBER, WHICH ARE ALWAYS POPULAR - THE FALL PIE SALE, AN EDMUND FITZGERALD REMEMBRANCE EVENT, AND THE CHRISTMAS COOKIE WALK. OUR MAJOR EVENT WAS A MURDER MYSTERY PARTY HELD IN JUNE AT THE MUSEUM. THE MUSEUM WAS TURNED INTO A 1928 SPEAK-EASY, WHERE ALL THE PASSENGERS ON THE TASHMOO HAD TO DISEMBARK AFTER A BODY WAS FOUND ON THE SHIP. ATTENDEES HAD ROLES TO PLAY AS THEY ENJOYED APPETIZERS AND CRAFT COCKTAILS OF THE TIME, AND SOLVED THE MYSTERY. EVERYONE DRESSED THEIR PART AND THE EVENING WAS TRULY SPECIAL.
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Legitimacy checks
Is it registered with the IRS? Passed.
Listed in the IRS master file of tax-exempt organizations as a 501(c)(3) charitable organization.
Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated September 7, 2026.
Has the IRS revoked its tax-exempt status? Passed.
Not on the IRS automatic revocation list.
Source: Automatic revocation of exemption list, Internal Revenue Service, file dated September 30, 2026.
Are donations tax-deductible? Passed.
On the IRS list of organizations eligible to receive tax-deductible contributions.
Source: Publication 78 data: organizations eligible for tax-deductible contributions, Internal Revenue Service, file dated September 10, 2026.
Is it keeping up with its IRS filings? Passed.
Most recent return on file covers the year ending December 2025.
Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated September 7, 2026.
How long has it been tax-exempt? Passed.
Recognized by the IRS since August 2010.
Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated September 7, 2026.
Is it in good standing with state regulators? Passed.
Not on California's list of charities barred from soliciting. Other states are not yet checked.
Source: May Not Operate or Solicit for Charitable Purposes list, California Attorney General, Registry of Charities and Fundraisers, file dated October 7, 2026.
Ratings and checks are our reading of public records, using the published method. They are not a statement about anyone's honesty. If you work for this organization, you can send corrections or results, confirm you want gifts through Veridonate, or ask to be removed from giving.