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    Mastodon State Historic Site

    4.6 (44 reviews)
    Open 9:00 am - 4:30 pm

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    Teresa R.

    Great hidden gem! Worth the 30 minute drive (just past Arnold, Mo). Picnic site with BBQ grills and Bathrooms were plentiful. There is a great playground and stream near picnic site and trails were accessible. The Museum was small but very informative and fun for the entire family. There is a $4 charge for entry (12 and under free), but well worth it.

    Spring Branch trailhead
    Jason P.

    Since we are still trying to be fairly cautious and not travel, I tried to make this holiday weekend feel like a mini camping "staycation." Last night we had a campsite in our backyard and made smores over a little fire! Today, the staycation continued with a trip south on 55 to Mastodon State Historic Site for a short hike and frolicing in the creek. Pro-Tip: don't park at the museum, which is the listed address. The parking lot there is very small and usually hard to find spots. There's a picnic site on Seckman Road that offers tons of parking as well as a playground and restrooms. We trekked on two different trails today, Limestone Hill Trail and Spring Branch Trail, which is the first trail you'll encounter when you park on Seckman Road. This trail is extremely flat and well manicured. It's perfect for an easy summer stroll for anyone of any fitness capability. This trail also has access to the creek. More on that to come! For a bit more of a challenge, safely cross Seckman Road to get on Limestone Hill Trail. This is a much more challenging trail. There are stones along the trail, so pay attention. It's a 1.75 mile loop with the first half uphill. While the trail was fairly busy, there was plenty of space to allow other hikers to pass safely. Our dog, Clyde, really enjoyed jumping up onto the rocks to get a bird's eye view of the trail! He was so excited to explore. We came back down the hillside to finish off the Spring Branch loop and to let Clyde cool off in the creek. The water was crystal clear and chilly. The creek is made up of smooth stones, so had we been sticking around for the whole day to hang out, we would have put on our water shoes. There were so many families on the banks of the creek. It felt like a kid-run float trip! Folks had coolers, chairs, mats and seemed to be pretty setup for the day. It seems like this would be an awesome way to get away from the house and still stay socially distant. Spring Branch offers a lot of different creek access points, but we find that the best one is in the Special Use Site. You cross a bridge to a large open field. This access point had several picnic tables on the creek bank and families had full lunch spreads ready to go. The picnic area in the parking lot offers two bathrooms. My boyfriend used the facilities and said they were pretty clean for a public park! That's rare. There was also a really big playground that was actually open. The picnic areas have small grills to use and are well spread apart to keep your distance from people who are not in your quarantine bubble. Overall, this park is a perfect morning or afternoon getaway. You feel like you're far enough from the city without needing to pack snacks for the trip.

    Lia L.

    GPS took us to a picnic area first. Only found the museum by chance. It's cute but maybe could be updated. I'd like to know more information about the adjoining house. But nice pretty little spot for a walk.

    Shhh! Don't tell anyone this mastodon is from Wisconsin!
    Jessica C.

    Four stars is a bit generous, but I just can't bring myself to give only three (A-OK) stars to a state park that is pretty unique. Let's be honest: who thinks about what was going on in Jefferson County during the Pleistocene epoch? Anyone? My point exactly. So to learn about the megafauna and Clovis culture that inhabited what was to be suburban St Louis 12,000 years ago is pretty cool. Did you know there were giant sloths (as in, Sasquatch sized) in addition to Mastodons roaming around? I thought that was pretty interesting. But on the other hand, the museum is informative, but small, and I would also add a bit incomplete. For example, the museum makes virtually no mention of the fact that the Kimmswick Bone Bed was also a lime quarry. You find this out by walking the trail. That seems like a fairly significant piece of history to gloss over in the museum. Oh, and the mastodom skeleton that is the highlight of the museum? It's not even from the area...it's from Wisconsin! The mastodon excavated from that site was sold to the British Museum. The hiking trail around the Bone Bed is almost half a mile long and makes for a nice, brief hike. If I lived close by, I'd definitely take advantage of the hiking opportunities. The museum is OK, all things considered, it just isn't as complete as it could be.

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    8 months ago

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    4 years ago

    Good park to get a short 3.5 miles hike in. Close to Arnold and easy to access. I go here all the time

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    5 years ago

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    3 years ago

    Well maintained and good for walking. Provides common area for gatherings and has a playground. Pets are often taken on the main paths.

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    7 years ago

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    5 years ago

    Museum not worth it but going to the trails is a great way to get out in nature with family. Good creek for kids to play in.

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    4 years ago

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    4 years ago

    Great place to visit. Excellent displays and informational. Not a big place so it doesn't take long to visit. Beautiful trails.

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    18 years ago

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    5 years ago

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    7 years ago

    Love this place! We always enjoy our time here in the creek and always meet nice people to boot!

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    10 years ago

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    13 years ago

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    7 years ago

    Come prepared: swim gear, water shoes, buckets, net, beach towels/chair, & sunscreen. Beautiful park and creek!

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    Ask the Community - Mastodon State Historic Site

    Review Highlights - Mastodon State Historic Site

    Limestone hill trail has a lot of washout on the trail so if hiking this one, plan for steep inclines, roots and rocks, and uneven surfaces.

    Mentioned in 3 reviews

    Read more highlights

    Cliff Cave County Park - Deer!

    Cliff Cave County Park

    4.5(35 reviews)
    7.6 mi

    Last weekend, it was such a sunny and warm-ish day for January, so we decided to take a little trip…read moreto Cliff Cave County Park with the pup. This was our first visit and so we parked in the lot that gps took us to and then followed the signs for the hiking trail. We were impressed with the number of hikers and mountain bikers out and about. What I really enjoyed about this park is that the trails are all easy to follow and loop around so that you can choose any direction to walk. We started with the shorter hike and walked to the overlook which was so pretty! We spent some time just watching the river and then decided to try another trail for a bit. Honestly, it was really nice to be outside. Baxter was so happy to be able to play in the leaves and we all got really excited because we saw a bunch of deer while we were out walking! Of course, when we saw them, we all stopped and just let the deer have their space to get where they were going. The loop that we completed was about 3 miles and I really appreciated how easy it was to navigate the park. We did not get over to the cave during this visit, but will plan to visit again on another warm-ish day so that we can explore the other trails.

    I've been to this park before and like that it offers walking trails not far from the city. The…read morewalking trails offer out and back trails, so I definitely got a couple miles of walking in. Fir those who want more of a "nature" feel there are some hiking and biking trails tucked away near the walking trails, which in my opinion, could use better trail markers. The hiking trails are still close to the border if the walking trails, so you don't go far into the wooded areas. My favorite part of the park were the caves, as soon as you enter the bottom of the trail where the caves are you can feel the cool air from the caves. It was great to check out and I wish the trails offered more scenic views in addition to this.

    Photos
    Cliff Cave County Park
    Cliff Cave County Park - Rugged trail to river

    Rugged trail to river

    Cliff Cave County Park - Restroom

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    Restroom

    Mastodon State Historic Site - parks - Updated May 2026

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