Sylvan Lake
East Custer, South Dakota · Custer State Park
Verified · 5 independent sources · top-verified
- WATER
- lake
- ACCESS
- Designated swim area
- FEE
- Yes, see below
- SEASON
- May
About Sylvan Lake
Sylvan Lake is a 17.3-acre man-made lake in Custer State Park in South Dakota's Black Hills, created in 1891 by a dam across Sunday Gulch Creek and ringed by distinctive granite formations. The park's official site lists it among the areas with a designated swim beach, and this granite-rimmed swimming hole is a well-known lake to swim in as well as a hub for small boat rental, rock climbing, and hiking, including trails toward Black Elk Peak and The Needles.
The lake sits amid the granite spires and domes characteristic of the Black Hills' Needles district, within Custer State Park, with a historic lodge (Sylvan Lake Lodge/Resort) directly on its shore and an approximately one-mile shoreline trail encircling the water (per Wikipedia).
Swimming at Sylvan Lake
Custer State Park designates a swim beach as part of its park amenities, but the official park page reviewed did not specify exact swimming-area boundaries, depth markers, or lifeguard presence at Sylvan Lake specifically. Wikipedia lists swimming as one of the lake's principal recreational activities alongside small rental boats and rock climbing.
The hike in
Swimming is drive-up: the designated swim beach sits right along the lakeshore next to Sylvan Lake Lodge/General Store parking, no hike needed. Optionally, a mild ~1-mile lakeshore loop trail circles the lake, and the same Sylvan Lake trailhead is the start of Trail #9 to Black Elk Peak (the highest point in South Dakota), a separate ~7-mile round-trip hike described by Wikipedia as the shortest, least strenuous, and most popular route to the summit.
A South Dakota state park entrance pass is required to use the Sylvan Lake trailhead area even if only hiking (per Wikipedia's Black Elk Peak article).
Plan your visit
Bringing kids
OK with supervision
Custer State Park designates an official swim beach at Sylvan Lake (per SD GFP), but visitor reports describe people swimming/jumping in off the granite rocks around the shoreline rather than a fully sandy, gradually-sloping entry, so supervision is advised for young kids. No lifeguard presence was confirmed in any source.
Parking
Paid, $25 vehicle entrance license (covers 1-7 consecutive days), required park-wide including Sylvan Lake
No separate Sylvan Lake parking fee was found beyond the standard Custer State Park vehicle license; visitor reviews describe the area as 'very packed'/'busy' during peak season, implying the lot can fill up.
Restrooms
Yes
Custer State Park's official page lists flush toilets and showers as park facilities (subject to closure Oct 1-Apr 30), and Sylvan Lake Lodge/General Store sit right at the lake with public-facing dining and retail, implying restroom access on-site during the May-October operating season; exact restroom location/type at the day-use beach itself was not separately confirmed.
Water clarity
Mostly clear
Visitor reports (campground reviews near the lake) describe the water as 'beautiful' and swimming/jumping conditions as 'amazing,' but no source gave a specific clarity/visibility measurement or used the words clear/murky directly.
Hours
Custer State Park operates year-round, but Sylvan Lake Lodge, the Sylvan Lake General Store, and restaurant operate seasonally May through October; park water systems (showers, flush toilets) may also close Oct 1-Apr 30.
On the water
Restrictions: Motorized watercraft are prohibited on Sylvan Lake, per the official lodge operator's site; only non-motorized craft are permitted.
Custer State Park Resort's Sylvan Lake Lodge page lists kayaking among on-lake activities and states 'Watersport Rentals' are available on-site; Wikipedia separately describes 'small rental boats' as an activity, but only kayaks were confirmed by name and photo from the operator's own site, so canoe/paddleboard are not listed as confirmed.
Rentals nearby
On-site non-motorized watersport rentals at Sylvan Lake, shown as kayaks tied up at a dock on the lake
At Sylvan Lake Lodge, directly on the Sylvan Lake shoreline · Lodge/general store/restaurant operate seasonally May through October; specific rental-counter hours not published
What regulars say
Campground-review visitors (thedyrt.com, reviews tied to the adjacent Sylvan Lake Campground) call the lake 'a MUST see' with 'beautiful' water and 'amazing' swimming where people jump in off the rocks; they also describe the area as 'very packed'/'busy and loud' with 'lots of folks coming and going' in peak season, though one visitor found Thursday/Friday quieter. One reviewer called it 'good for spending time with kids,' and facilities were praised as 'clean bathrooms and hot shower.' These are visitor reports, not independently verified by park staff.
Backstory
The lake is not natural; it was created in 1891 when Theodore Reder built the Sylvan Lake Water Dam across Sunday Gulch Creek. A hotel operated on the lakeshore in the early 20th century (predecessor to today's Sylvan Lake Lodge/Resort). The lake was featured in the 2007 Disney film National Treasure: Book of Secrets, though the film depicted it as directly behind Mount Rushmore when it is actually about five miles southwest of the monument.
Sylvan Lake: FAQ
Does Sylvan Lake charge a fee?
Custer State Park is a fee-access state park; the official site provides an online pass-purchase/reservation portal, but the specific entrance license price and any separate swim-beach fee were not stated in the sources reviewed.
Is Sylvan Lake kid friendly?
Custer State Park designates an official swim beach at Sylvan Lake (per SD GFP), but visitor reports describe people swimming/jumping in off the granite rocks around the shoreline rather than a fully sandy, gradually-sloping entry, so supervision is advised for young kids. No lifeguard presence was confirmed in any source.
Do I need to hike to reach Sylvan Lake?
No significant hike is required. The swimming area is close to parking and access.
Where do I park for Sylvan Lake?
No separate Sylvan Lake parking fee was found beyond the standard Custer State Park vehicle license; visitor reviews describe the area as 'very packed'/'busy' during peak season, implying the lot can fill up.
Can I bring a kayak or paddleboard to Sylvan Lake?
Custer State Park Resort's Sylvan Lake Lodge page lists kayaking among on-lake activities and states 'Watersport Rentals' are available on-site; Wikipedia separately describes 'small rental boats' as an activity, but only kayaks were confirmed by name and photo from the operator's own site, so canoe/paddleboard are not listed as confirmed.
When is the best time to visit Sylvan Lake?
Not explicitly stated for swimming, but the official park page notes showers, flush toilets, and other water systems may be closed between Oct. 1 and April 30, implying the developed-facility swim season runs roughly May through September.
What are the rules at Sylvan Lake?
Per the official park page: pets must be on a leash no longer than 10 feet and are not allowed on designated swim beaches or in park buildings.
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