Skip to main content
IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 20-5887108

LAMB SPRING ARCHAEOLOGICAL PRESERVE

Tax-exempt · LITTLETON, CO 80125

Financials

$3K$2102023$7K$3882024$5K$2K2025
Revenue Expenses · by fiscal year end
Financials of LAMB SPRING ARCHAEOLOGICAL PRESERVE by year, from its e-filed returns
Year endedFormRevenueExpensesNet incomeTotal assetsLiabilitiesNet assets
December 31, 2025990-EZ$4,654$1,530$3,124$28,327$0$28,327
December 31, 2024990-EZ$7,079$388$6,691$26,674$0$26,674
December 31, 2023990-EZ$3,210$210$3,000$21,140$0$21,140
Financial details: 990-EZ for the year ended December 31, 2025

Revenue

Contributions, gifts and grants
$4,653
Program service revenue
$0
Investment income
$1
Other revenue
$0

Expenses

Grants and similar amounts paid
$0
Compensation of officers, directors and key employees
$0
Salaries, compensation and benefits (total)
$1,530

Balance sheet and other

Total assets, start of year
$26,674
Total assets, end of year
$28,327
Total liabilities, end of year
$0
Net assets, end of year
$28,327
Cash, savings and investments
$25,878
Gross receipts
$4,654

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-EZ for the year ended December 31, 2025, highest compensation first.

NameTitleHours / weekCompensation
Nathan BoylessDirector0.77$0
Susan CollinsVice President0.77$0
Dr Barbara PageDirector1.54$0
Dr Maxine McBrinnPresident1.92$0
Harold SmethillsTreasurer0.77$0
Dr James DixonEx Officio Director0.23$0
Steve ShermanBoard Co-Chair2.31$0
Megan OferDirector0.77$0
Cameron RandolphBoard Co-Chair2.31$0
Miranda LudwigAccountant0.5$0
Dr Craig LeeDirector0.77$0
Dr Will TaylorDirector0.77$0
Brittany CassellDirector0.77$0
Dr Russ GrahamEx Officio Director0.25$0
Jack WarnerDocent0.25$0
2 more people on this return
NameTitleHours / weekCompensation
Beth FisherDocent0.25$0
Betsy HealeyDocent0.25$0
990-EZ for the year ended December 31, 2024: 17 people
NameTitleHours / weekCompensation
Nathan BoylessDirector0.77$0
Susan CollinsVice President0.77$0
Dr Barbara PageSecretary1.54$0
Dr Maxine McBrinnPresident1.92$0
Harold SmethillsTreasurer0.77$0
Dr James DixonHonorary Advisor0.23$0
Steve ShermanChairman2.31$0
Megan OferDirector0.77$0
Cameron RandolfDirector2.31$0
Sandra GilmourAccountant0.77$0
Dr Craig LeeDirector0.77$0
Carlton GoverVolunteer0.77$0
Brittany CasselVolunteer0.77$0
Dr Russ GrahamHonorary Advisor0.25$0
Jack WarnerDocent0.25$0
Stephanie BoktorDocent0.25$0
Betsy HealyDocent0.25$0
990-EZ for the year ended December 31, 2023: 17 people
NameTitleHours / weekCompensation
Nathan BoylessDirector0.77$0
Susan CollinsVice President0.77$0
Dr Barbara PageSecretary1.54$0
Dr Maxine McBrinnPresident1.92$0
Harold SmethillsTreasurer0.77$0
Dr James DixonHonorary Advisor0.23$0
Steve ShermanChairman2.31$0
Megan OferDirector0.77$0
Cameron RandolfDirector2.88$0
Sandra GilmourAccountant0.77$0
Dr Craig LeeDirector0.77$0
Carlton GoverVolunteer0.77$0
Brittany CasselVolunteer0.77$0
Dr Russ GrahamHonorary Advisor0.25$0
Jack WarnerDocent0.25$0
Stephanie BoktorDocent0.25$0
Betsy HealyDocent0.25$0

Address and contacts

Address (IRS master file)
8155 PINEY RIVER AVE SUITE 200, LITTLETON, CO 80125-8728
In care of
% HAROLD R SMETHILLS
Mailing address (990-N for 2015)
1805 Shea Center Drive 210, Highlands Ranch CO 80129
Principal officer (990-N for 2015)
Nathan Boyless, 1805 Shea Center Drive Ste 210, Highlands Ranch CO 80129
Signed the 990-EZ
Harold Smethills, Treasurer
Phone
(303) 202-6800

Mission

The corporation is organized exclusively for charitable, educational and scientific purposes including for such purposes the developing fund raising, building and operations of an on-site museum at the Lamb Spring Archaeological Preserve site. The Lamb Spring Board administers several tours per year for numerous attendees who reside in the Denver Metro area. Various scientific publications about Lamb Spring were published between 1960 and 2004 by Denver Museum of Nature and Science began a review of all artifact previously excavated from the site to determine radiocarbon dates of Megafauna remains. The Board is working with other scientists to promote additional studies.

990-EZ for the year ended December 31, 2025

Program accomplishments

  • The organization was able to provide a few site tours which generated some donations. We also received donations from Colorado Gives Day.

What it must file and when

IRS records say it files Form 990-N (e-Postcard). Gross receipts normally $50,000 or less. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025December 31, 2025May 15, 2026990-EZ on file
2024December 31, 2024May 15, 2025990-EZ on file
2023December 31, 2023May 15, 2024990-EZ on file

File the 2026 990-N for LAMB SPRING ARCHAEOLOGICAL PRESERVE

Due May 17, 2027 · e-filed with the IRS by 990.tax, an IRS-authorized e-file provider

IRS record

EIN
20-5887108
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
2007
Accounting year ends
December
Files
Form 990-N (e-Postcard)
Assets (IRS master file)
$28,327
Income (IRS master file)
$4,654

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-EZDecember 2025$4,654$1,530$28,327IRS
990-EZDecember 2024$7,079$388$26,674XML
990-EZDecember 2023$3,210$210$21,140XML
990-EZDecember 2022–––IRS
990-EZDecember 2021–––IRS
990-N for 2015
Officer: Nathan Boyless
December 31, 2015≤ $50,000 receipts––e-Postcard

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 20-5887108).

Questions about LAMB SPRING ARCHAEOLOGICAL PRESERVE

What is the EIN of LAMB SPRING ARCHAEOLOGICAL PRESERVE?
The employer identification number (EIN) of LAMB SPRING ARCHAEOLOGICAL PRESERVE is 20-5887108.
Is LAMB SPRING ARCHAEOLOGICAL PRESERVE tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2007.
Are donations to LAMB SPRING ARCHAEOLOGICAL PRESERVE tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does LAMB SPRING ARCHAEOLOGICAL PRESERVE file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of LAMB SPRING ARCHAEOLOGICAL PRESERVE 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 LAMB SPRING ARCHAEOLOGICAL PRESERVE last file with the IRS?
The latest return in the IRS public files is the 990-EZ for the year ended December 2025.
Who is the principal officer of LAMB SPRING ARCHAEOLOGICAL PRESERVE?
The 990-N for 2015 names Nathan Boyless.
Who are the officers and directors of LAMB SPRING ARCHAEOLOGICAL PRESERVE?
The 990-EZ for the year ended December 31, 2025 lists 17 people; 0 received compensation from the organization.
How much revenue does LAMB SPRING ARCHAEOLOGICAL PRESERVE have?
On its 990-EZ for the year ended December 31, 2025 it reported revenue of $4,654, expenses of $1,530 and total assets of $28,327 at year end.

Other nonprofits in LITTLETON

All nonprofits in LITTLETON · Colorado · Arts, culture and humanities