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Deerfield Reservoir is a reservoir located in South Dakota. At around 414 acres, it is a modest waterbody. Nearby alternatives include Pactola Lake, Sylvan Lake, and Belle Fourche Reservoir. For this location, LakeRadar tracks an hourly and 7-day forecast, wind and gust outlook, and activity scores for boating, paddling, and swimming. Use the conditions and forecast on this page to decide when to go boating, fishing, or paddling at Deerfield Reservoir.
Updated
No active alerts for this lake as of the last check (Oct 9, 5:39 AM CDT). Alerts are re-checked automatically; see the official source for updates.
Overall Good (87/100) across 4 activities. Best right now: Boating (92/100).
How the score is calculated →Best excellent fishing window, averaging 92/100 across these hours. Wind 5 mph from the southwest. Dusk hours (18:00 local). Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 39° | 40° | 41° | 45° | 51° | 58° | 64° | 68° | 71° | 73° | 75° | 76° | 75° | 71° | 68° | 65° | 64° | 62° | 61° | 60° | 59° | 58° | 57° | 56° |
| Wind (kts) | 4 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 10 | 11 | 11 | 11 | 11 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 |
| Direction | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW |
| Gusts (kts) | 13 | 15 | 16 | 17 | 18 | 17 | 18 | 20 | 21 | 21 | 22 | 23 | 22 | 20 | 18 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 17 | 17 |
| Precip % | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 2% | 2% | 2% | 2% | 2% | 2% | 2% | 2% | 2% | 2% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 5 AM CDT | 39°F | 5 mph SW (225°) | 15 mph | 0% | 10% | Mostly Clear |
| Fri, 6 AM CDT | 40°F | 6 mph SW (225°) | 17 mph | 0% | 9% | Mostly Clear |
| Fri, 7 AM CDT | 41°F | 6 mph SW (225°) | 18 mph | 0% | 13% | Sunny |
| Fri, 8 AM CDT | 45°F | 6 mph SW (225°) | 20 mph | 0% | 18% | Sunny |
| Fri, 9 AM CDT | 51°F | 7 mph SW (225°) | 21 mph | 0% | 8% | Sunny |
| Fri, 10 AM CDT | 58°F | 7 mph SW (225°) | 20 mph | 0% | 4% | Sunny |
| Fri, 11 AM CDT | 64°F | 7 mph SW (225°) | 21 mph | 0% | 2% | Sunny |
| Fri, 12 PM CDT | 68°F | 8 mph SW (225°) | 23 mph | 0% | 5% | Sunny |
| Fri, 1 PM CDT | 71°F | 12 mph SW (225°) | 24 mph | 0% | 5% | Sunny |
| Fri, 2 PM CDT | 73°F | 13 mph SW (225°) | 24 mph | 0% | 5% | Sunny |
| Fri, 3 PM CDT | 75°F | 13 mph SW (225°) | 25 mph | 0% | 5% | Sunny |
| Fri, 4 PM CDT | 76°F | 13 mph SW (225°) | 27 mph | 0% | 5% | Sunny |
| Fri, 5 PM CDT | 75°F | 13 mph SW (225°) | 25 mph | 0% | 8% | Sunny |
| Fri, 6 PM CDT | 71°F | 9 mph SW (225°) | 23 mph | 0% | 6% | Sunny |
| Fri, 7 PM CDT | 68°F | 8 mph SW (225°) | 21 mph | 2% | 8% | Mostly Clear |
| Fri, 8 PM CDT | 65°F | 8 mph SW (225°) | 22 mph | 2% | 8% | Mostly Clear |
| Fri, 9 PM CDT | 64°F | 8 mph SW (225°) | 22 mph | 2% | 9% | Mostly Clear |
| Fri, 10 PM CDT | 62°F | 8 mph SW (225°) | 22 mph | 2% | 8% | Mostly Clear |
| Fri, 11 PM CDT | 61°F | 8 mph SW (225°) | 22 mph | 2% | 8% | Mostly Clear |
| Sat, 12 AM CDT | 60°F | 8 mph SW (225°) | 22 mph | 2% | 9% | Mostly Clear |
| Sat, 1 AM CDT | 59°F | 8 mph SW (225°) | 21 mph | 2% | 11% | Mostly Clear |
| Sat, 2 AM CDT | 58°F | 8 mph SW (225°) | 21 mph | 2% | 13% | Mostly Clear |
| Sat, 3 AM CDT | 57°F | 7 mph SW (225°) | 20 mph | 2% | 15% | Mostly Clear |
| Sat, 4 AM CDT | 56°F | 7 mph SW (225°) | 20 mph | 2% | 13% | Mostly Clear |
| Sat, 5 AM CDT | 55°F | 7 mph SW (225°) | 20 mph | 2% | 12% | Mostly Clear |
Official National Weather Service hourly forecast. Showing 10 of 25 hours. Wind arrows point the way the wind is blowing; the compass point and degrees show where it comes from.
| Period | Overnight October 9, 2026 | Friday October 9, 2026 | Friday Night October 9, 2026 | Saturday October 10, 2026 | Saturday Night October 10, 2026 | Sunday October 11, 2026 | Sunday Night October 11, 2026 | Columbus Day October 12, 2026 | Monday Night October 12, 2026 | Tuesday October 13, 2026 | Tuesday Night October 13, 2026 | Wednesday October 14, 2026 | Wednesday Night October 14, 2026 | Thursday October 15, 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 38° | 76° | 52° | 74° | 47° | 62° | 39° | 57° | 38° | 57° | 38° | 51° | 35° | 45° |
| Wind | SW 6 mph | SW 6 to 13 mph | SW 8 mph | SW 5 to 8 mph | SW 3 mph | SW 1 to 5 mph | SE 3 mph | SW 2 to 6 mph | NW 2 mph | S 5 mph | S 3 mph | W 3 to 8 mph | NW 7 to 14 mph | NW 16 mph |
| Gusts | 17 mph | 27 mph | 22 mph | 23 mph | 15 mph | 17 mph | 13 mph | 22 mph | 12 mph | 18 mph | 15 mph | 27 mph | 33 mph | 39 mph |
| Precip % | 0% | 0% | 2% | 2% | 24% | 11% | 51% | 31% | 36% | 26% | 63% | 67% | 66% | 51% |
| Forecast |
Good for fishing (87/100), from 5 available inputs. Supporting this: Wind 5 mph from the southwest. 0% chance of precipitation. Working against it: Air temperature 39°F. Not available from a verified source for this lake: pressure trend, water temperature. Confidence is moderate (74%) because some inputs are unavailable or older than ideal.
Excellent for boating (92/100), from 4 available inputs. Supporting this: Wind 5 mph from the southwest. No active official alerts for this lake. Not available from a verified source for this lake: visibility and conditions, verified water access. Confidence is moderate (84%) because some inputs are unavailable or older than ideal.
Good for sailing (78/100), from 4 available inputs. Supporting this: No active official alerts for this lake. 0% chance of precipitation. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Good for kayaking (89/100), from 5 available inputs. Supporting this: Wind 5 mph from the southwest. No active official alerts for this lake. Working against it: Air temperature 39°F. Confidence is high (90%).
Water temperature is not available from a verified source for this lake. No swimming score is shown without it.
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Individual boat ramp GPS coordinates are maintained under the jurisdiction of SD Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
Surrounded by the natural landscapes of SD, Deerfield Reservoir is an appealing freshwater reservoir welcoming outdoor recreation across all seasons. The lake provides critical habitat for native fish species and serves as a focal point for regional boating. Visitors should review current access fees, ramp operational status, and state licensing rules.
Valid freshwater sport fishing license issued by South Dakota Game, Fish and Parks (SDGFP) is required for anglers age 16+. Digital license on mobile is accepted.
Current motorized watercraft registration mandatory. Practice Clean, Drain & Dry protocols: drain all livewells and inspect props before launching. Life jackets required for all passengers.
Public shoreline and boating access managed by State & Local Authorities. Verify seasonal gate hours, launch fees, and parking rules before travel.
Low-wake cruising, electric-troll fishing craft, and quiet-water exploration. Target gamefish include Brown Trout, Brook Trout, Rainbow Trout. Morning hours typically provide optimal glassy conditions for kayak and stand-up paddleboard (SUP) touring.
Warm water temperatures, peak swimming, active watersports, and open full-service campgrounds. Highest weekly attendance; plan early arrivals on summer weekends.
Spring pre-spawn and fall feeding transitions create prime trophy angling conditions. Cooler air, lower boat traffic, and vibrant seasonal shoreline foliage.
Northern cold winter conditions with freezing air temperatures and potential surface ice formation. Ramps and water systems may be winterized. Confirm open status before visiting.
No external source rows are cited by the data currently shown on this page.
Updated
Scores are heuristics, not safety guarantees. LakeRadar scores summarize available conditions and are not a substitute for official warnings, local rules, or on-water judgment.
All telemetry for Deerfield Reservoir is synchronized directly from authorized federal and state monitoring networks (USGS, NWS, NOAA, and state environmental authorities). Observations are strictly instrumented readings — unmonitored sensors are transparently disclosed rather than synthetic estimates.
Last source audit: Oct 9, 5:39 AM CDT