Mastodon State Historic Site

08/05/2026

05/27/2026

Looking for a fun, free and family-friendly plan tomorrow night (Thursday, May 28)? Ant-icipation is already building!

Join us at Mastodon State Historic Site for a special outdoor screening of the animated classic, "Antz!"

Time: 8 p.m. - 9:30 p.m.

Location: The lawn right outside the Visitor Center

Grab your colony, pack up your favorite snacks and drinks and don’t forget your lawn chairs or blankets to stay cozy. It’s going to be a giant amount of fun (even if the movie is about tiny bugs)!

Cost: Completely FREE!️

Tag a friend you want to invite in the comments below!

05/24/2026

Join us on Thursday, May 28, at 8 p.m. for a showing of the movie "Antz." The movie will end around 9:30 p.m.

This family-friendly event will take place on the lawn outside the visitor center. Attendees are encouraged to bring lawn chairs, blankets, snacks and drinks.

Come join the fun!!

03/24/2026

We've got a honeysuckle problem, and we need your help! Honeysuckle is an invasive species and is damaging to our natural ecosystem. It outcompetes the native plants and quickly dominates the landscape. Volunteers will help us remove this invasive plant by cutting and treating the roots.

Join us from 9 a.m. to noon for any of our upcoming Honeysuckle Hacks:
Saturday March 28,
Saturday April 25
Saturday May 30
Saturday June 27

If you're interested in volunteering at the site for a one-time event (or more!), we would love to have you! Please call/text the site interpreter at 636-215-9784 with questions. Make sure to register on mostateparks.com/volunteer or call the site interpreter. In the event of weather-related cancellations, we will notify everyone on the registration list.

Volunteers should wear pants and sturdy shoes, bring insect repellant, gloves if available, and water. We will provide the tools. Volunteers will meet at the museum parking lot, located at 1050 Charles J. Becker Drive in Imperial.

02/20/2026

Join us for the Living With Water Living with Water: An Introduction to Your Rock Creek Watershed!
When? Thursday, Feb. 26 from 5- 7 p.m.
Date: February 26, 2026

This open-house style event will feature representatives from multiple agencies with displays, educational materials and interactive opportunities for the public. Elected officials will also be present to address water-related questions. .

02/11/2026

facts:

Freshwater habitats are home to more than 100,000 different species of plants, animals and insects.

02/04/2026

Today is .

Did you know…

The Meramec River provides clean drinking water to more than 200,000 people across Franklin, Jefferson and South St. Louis counties? That’s more than 70,000 homes connected to this great river. Storm drains within the Meramec drainage basin send their water straight back into the Meramec, so it’s important to pay attention to what goes down our drains. Healthy choices at home help keep this river healthy.

01/28/2026

As of this morning, Mastodon State Historic Site visitor center and picnic area parking lots are now open and operating with our normal off-season hours! The Wildflower Trail will remain closed due to snow and ice on the stairs.

01/28/2026

It's time for !

Did you know…
Missouri is home to seven first-magnitude springs?

First-magnitude springs produce at least 1 cubic foot of water per second—or about 65 million gallons per day! Big Spring is the largest single-outlet spring, producing an incredible 286 million gallons of water every day.

01/21/2026

It's ! Did you know karst is a landscape where rock such as limestone, marble and gypsum is dissolved to turn into sinkholes, caves, springs, etc.? Karst is ideal for storing water as an aquifer and provides vast amounts of clean drinking water to people, plants and animals.