Blue Stream Fly Fishing
Fly Fishing Report for:

Castle Creek - Below Deerfield - South Dakota

Hatch Chart - Best Access/Spots - Local Fish - About

Water Flow Chart

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Using Water Flow Charts & Weather Reports: Begin with our water flow charts to grasp stream velocity and volume – look for stable or rising trends to pinpoint ideal fishing times. Learn to interpret sudden spikes or drops, which can indicate potential challenges. Next, consult our weather reports to understand ambient conditions. Pairing the two, you can anticipate fish behavior, choose the right gear, and select the best fishing spots. Use these tools together for a holistic approach to your next fishing adventure.

In-Depth Weather

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Directions To Location

Hatch Chart

Month Hatch Time of Day Recommended Fly Sizes Popular Fly Patterns
January Midges Afternoon 18-22 Zebra Midge, Griffith's Gnat
February Midges Afternoon 18-22 Zebra Midge, Griffith's Gnat
March Midges, Blue-Winged Olives Afternoon 16-22 Zebra Midge, Griffith's Gnat, Adams
April Blue-Winged Olives, Caddis Afternoon 14-20 Adams, Elk Hair Caddis
May Caddis, Stoneflies Mid-day to Evening 8-14 Elk Hair Caddis, Golden Stonefly
June Caddis, Stoneflies, PMDs Morning to Evening 12-18 Elk Hair Caddis, Golden Stonefly, Pheasant Tail Nymph
July Caddis, Stoneflies, PMDs, Terrestrials Morning to Evening 8-18 Hopper Patterns, Pheasant Tail Nymph
August Caddis, Terrestrials Morning to Evening 8-18 Hopper Patterns, Elk Hair Caddis
September Terrestrials, Blue-Winged Olives Morning to Evening 12-20 Adams, Hopper Patterns
October Blue-Winged Olives, Midges Afternoon 18-22 Adams, Zebra Midge
November Midges Afternoon 18-22 Zebra Midge, Griffith's Gnat
December Midges Afternoon 18-22 Zebra Midge, Griffith's Gnat

While we strive to ensure the precision of our hatch charts, some reflect broader river region insights. Through ongoing partnerships with local guides and fly shops, we’re committed to refining our data. Should you notice any inconsistencies or have feedback, we welcome you to reach out. 

Best Fishing Spots

The Castle Creek, below Deerfield presents an array of fantastic locales to indulge your passion for fly fishing. The spots not only come with lively waters vaunting a rich aquatic life but also enchant with striking scenic beauty.

  • Harney Park: Rich in fish density and species diversity. The bright rainbows and lively brown trout never fail to make a catch.
  • Castle Creek Bridge: A favorite for anglers, this spot hosts an impressive population of rainbows and brooks.
  • Seven Sisters: Offering a serene environment, the waters here are abundant with brooks, especially during the spawning season.
  • Deerfield Reservoir: Not part of Castle Creek technically, but nearby. Boasting stocked trout (including splake) for an assured catch.
  • Castle Peak Trailhead: Catch rainbows, cutthroats or brooks all in one spot amidst the beautiful surroundings of Black Hills National Forest.

Best Access Points

Below Deerfield, Castle Creek is a fantastic destination for fly fishing enthusiasts. Several access points can ease your approach:

  • 1. Rumsey Bridge: For a productive start, this is the first access point downstream from Deerfield Dam. You will find ample parking space here.
  • 2. Gold Mountain Campground: Located about four miles from Rumsey Bridge, there’s good fishing both above and below the campground.
  • 3. Castle Creek Trailhead: Approximately a mile before the city of Mystic, the trailhead offers excellent fishing points, particularly in the spring months.
  • 4. City of Mystic: The old mining town located two miles downstream from the Castle Creek Trailhead. It’s a perfect location for a fishing outing.
  • 5. Castle Creek Bridge on US Highway 385: Located where Castle Creek flows into Rapid Creek, this point is excellent for larger trout.

Please remember to adhere to local fishing regulations and respect private property where applicable.

Local Fish

  • Brown Trout: Brown Trout are the most popular species targeted by anglers in Castle Creek due to their abundant population.
  • Rainbow Trout: Plentiful in Castle Creek and highly sought after for their beautiful color and fighting spirit.
  • Brook Trout: Found in many tributaries of Castle Creek, Brook Trout are a favorite amongst fly fishers due to their aggressive nature and beautiful coloration.
  • Cutthroat Trout: Native to the Black Hills area, Cutthroat Trout are prized by fly fishers for their rarity and the challenge they present.
  • Mountain Whitefish: Most abundant during the colder months, Mountain whitefish provide a great opportunity for fly fishing in Castle Creek.
  • Black Bullhead: This catfish species can be a surprising catch for fly fishers in Castle Creek. Although not often targeted, they put up a good fight and can be an interesting catch.
  • Yellow Perch: Not typically associated with fly fishing, Yellow Perch can be found in the lower sections of Castle Creek. They add variety to any angler’s catch.
  • Northern Pike: Although not very common, Northern Pike can sometimes be spotted in the deeper waters of Castle Creek. They provide an exciting challenge for experienced fly fishers.

About The River

The Castle Creek – Below Deerfield is a captivating region nestled between the Black Hills of South Dakota. Its rich history dates back to the Gold Rush era, a fascinating period that breathed life into this tranquil location.

  • In the late 1800s, gold was discovered here. Castle Creek was a hive of activity then, echoing with the clamor of countless hopeful miners seeking their fortune.
  • Although the gold rush ended, the left-behind cabins, machinery, and tools that pepper the creek serve as historical reminders of that vibrant era.
  • The area is also home to diverse wildlife, contributing to its enchanting natural appeal. You’re likely to encounter deer, trout, and several bird species on a visit here.

Today, visitors to Castle Creek – Below Deerfield enjoy fishing, hiking, and especially immersing themselves in its fascinating past. The combination of this area’s historical lure, its captivating wilderness, and serene surroundings truly make it a hidden gem in South Dakota.


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