Where is Sylvan Lake?

Sylvan Lake is a lake in East Custer, South Dakota.

How is Sylvan Lake rated?

Sylvan Lake in East Custer, South Dakota has an average visitor rating of 4.8 out of 5, based on 692 reviews.

What amenities does Sylvan Lake have?

Visitor-listed amenities at Sylvan Lake include camping-nearby.

Updated August 13, 2025

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Photo: Sylvan Lake - Custer State Park - South Dakota - 10 Dec. 2017 by Sharon Mollerus (CC BY 2.0) License

Sylvan Lake

Lake · East Custer, South Dakota

4.8(692 reviews)

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Great conditions todaycamping-nearby

Tranquil lake area for swimming, canoeing, hiking, picnicking & rock climbing on large outcroppings.

Things to Do Near Sylvan Lake

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Weather at Sylvan Lake

H: 87° L: 60°

Sunny

87°

Feels like 80°

Precipitation

Humidity

16%

Wind

7 mph

UV Index

7.5

Water Conditions:

🏊Perfect for swimming🧴High UV - use sunscreen

12 AM

61°

3 AM

60°

6 AM

60°

9 AM

78°

12 PM

85°

3 PM

85°

6 PM

81°

9 PM

67°

Pack smarter for Sylvan Lake

Useful gear categories for this kind of water spot. These links open Amazon search results so you can compare current options.

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Inflatable PaddleboardA popular way to explore calm coves and shorelines.

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Life JacketImportant around boats, paddling, and deeper swimming areas.

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Floating CoolerKeeps drinks nearby for swim areas, docks, and boats.

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Waterproof Phone PouchProtects phones around docks, boats, and splashy shorelines.

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Frequently asked questions

Where is Sylvan Lake?: Sylvan Lake is a lake in East Custer, South Dakota.
Can you swim at Sylvan Lake?: There is no fixed answer for Sylvan Lake: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Sylvan Lake in East Custer, South Dakota. Check current water conditions before you go, and follow posted signs and local guidance.
How is Sylvan Lake rated?: Sylvan Lake in East Custer, South Dakota has an average visitor rating of 4.8 out of 5, based on 692 reviews.
What amenities does Sylvan Lake have?: Visitor-listed amenities at Sylvan Lake include camping-nearby.

Visitor Reviews

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Been here? A quick note helps the next visitor plan their day. Handy things to mention:

Water temperatureCrowds & parkingBest time to goSafety & access

Best Times to Visit

☀️

Right Now

Very warm - visit early morning or evening

🏞️ Lakes Tips:

›Check for boat launch facilities and fees
›Obtain required fishing licenses before arrival
›Be aware of lake-specific regulations and restrictions
›Monitor water quality reports before swimming

Best Seasons:

☀️ Summer (Jun-Aug)🍂 Fall (Sep-Nov)🌸 Spring (Mar-May)

Location & Contact

East Custer, SD 57730

East Custer, South Dakota 57730

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