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In South Dakota, Angostura Reservoir is a reservoir used for time on and around the water. It reaches a maximum depth of roughly 75 feet at an elevation of about 3,187 feet. It covers roughly 4,407 surface acres (about 7 square miles). Research-grade observations nearby include Channel Catfish, Green Sunfish, Bluegill, and Rock Bass. If you are planning a trip, Sylvan Lake, Deerfield Reservoir, and Pactola Reservoir are also nearby. Water data on this page comes from a mapped monitoring station near the lake. The page brings together an hourly and 7-day forecast, wind and gust outlook, water readings, fishing conditions, and activity scores for boating, paddling, and swimming. Current weather, wind, and activity conditions for Angostura Reservoir are updated throughout the day.
Updated
Latest source update is older than expected. Use caution and check the official source.
The last automated check (Oct 11, 3:32 AM MDT) found no active alerts for this lake, but that check is older than LakeRadar's alert freshness window, so the current alert status could not be confirmed.
Confirm before heading out: official alerts for this area or weather.gov/alerts. LakeRadar scores summarize available conditions and are not a substitute for official warnings, local rules, or on-water judgment.
Overall Good (89/100) across 4 activities. Best right now: Boating (94/100).
How the score is calculated →Best excellent fishing window, averaging 91/100 across these hours. Wind 6 mph from the northeast. Dawn hours (06:00 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) | 58° | 56° | 54° | 54° | 55° | 56° | 59° | 63° | 65° | 67° | 69° | 70° | 70° | 68° | 65° | 61° | 59° | 58° | 56° | 55° | 54° | 53° | 51° | 50° |
| Wind (kts) | 4 | 5 | 5 | 6 | 7 | 9 | 10 | 10 | 10 | 10 | 12 | 14 | 15 | 17 | 18 | 18 | 19 | 19 | 19 | 18 | 17 | 16 | 14 | 13 |
| Direction | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE |
| Gusts (kts) | 11 | 12 | 14 | 15 | 16 | 16 | 17 | 16 | 16 | 17 | 19 | 21 | 22 | 24 | 26 | 26 | 26 | 26 | 26 | 25 | 23 | 22 | 19 | 18 |
| Precip % | 2% | 2% | 3% | 3% | 3% | 2% | 2% | 2% | 5% | 5% | 5% | 5% | 5% | 5% | 28% | 28% | 28% | 28% | 28% | 28% | 25% | 25% | 25% | 25% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Sun, 4 AM MDT | 58°F | 5 mph NE (45°) | 13 mph | 2% | 81% | Mostly Cloudy |
| Sun, 5 AM MDT | 56°F | 6 mph NE (45°) | 14 mph | 2% | 74% | Mostly Cloudy |
| Sun, 6 AM MDT | 54°F | 6 mph NE (45°) | 16 mph | 3% | 65% | Partly Sunny |
| Sun, 7 AM MDT | 54°F | 7 mph NE (45°) | 17 mph | 3% | 70% | Mostly Cloudy |
| Sun, 8 AM MDT | 55°F | 8 mph NE (45°) | 18 mph | 3% | 76% | Mostly Cloudy |
| Sun, 9 AM MDT | 56°F | 10 mph NE (45°) | 18 mph | 2% | 73% | Mostly Cloudy |
| Sun, 10 AM MDT | 59°F | 12 mph NE (45°) | 20 mph | 2% | 70% | Mostly Cloudy |
| Sun, 11 AM MDT | 63°F | 12 mph NE (45°) | 18 mph | 2% | 72% | Mostly Cloudy |
| Sun, 12 PM MDT | 65°F | 12 mph NE (45°) | 18 mph | 5% | 68% | Partly Sunny |
| Sun, 1 PM MDT | 67°F | 12 mph NE (45°) | 20 mph | 5% | 45% | Mostly Sunny |
| Sun, 2 PM MDT | 69°F | 14 mph NE (45°) | 22 mph | 5% | 43% | Mostly Sunny |
| Sun, 3 PM MDT | 70°F | 16 mph NE (45°) | 24 mph | 5% | 46% | Mostly Sunny |
| Sun, 4 PM MDT | 70°F | 17 mph NE (45°) | 25 mph | 5% | 50% | Mostly Sunny |
| Sun, 5 PM MDT | 68°F | 20 mph NE (45°) | 28 mph | 5% | 52% | Partly Sunny |
| Sun, 6 PM MDT | 65°F | 21 mph NE (45°) | 30 mph | 28% | 51% | Chance Rain Showers |
| Sun, 7 PM MDT | 61°F | 21 mph NE (45°) | 30 mph | 28% | 55% | Chance Rain Showers |
| Sun, 8 PM MDT | 59°F | 22 mph NE (45°) | 30 mph | 28% | 58% | Chance Rain Showers |
| Sun, 9 PM MDT | 58°F | 22 mph NE (45°) | 30 mph | 28% | 53% | Chance Rain Showers |
| Sun, 10 PM MDT | 56°F | 22 mph NE (45°) | 30 mph | 28% | 58% | Chance Rain Showers |
| Sun, 11 PM MDT | 55°F | 21 mph NE (45°) | 29 mph | 28% | 57% | Chance Rain Showers |
| Mon, 12 AM MDT | 54°F | 20 mph NE (45°) | 27 mph | 25% | 63% | Chance Rain Showers |
| Mon, 1 AM MDT | 53°F | 18 mph NE (45°) | 25 mph | 25% | 57% | Chance Rain Showers |
| Mon, 2 AM MDT | 51°F | 16 mph NE (45°) | 22 mph | 25% | 64% | Chance Rain Showers |
| Mon, 3 AM MDT | 50°F | 15 mph NE (45°) | 21 mph | 25% | 76% | Chance Rain Showers |
| Mon, 4 AM MDT | 50°F | 13 mph NE (45°) | 17 mph | 25% | 80% | Chance Rain Showers |
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 | Tonight October 10, 2026 | Overnight October 11, 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 | Thursday Night October 15, 2026 | Friday October 16, 2026 | Friday Night October 16, 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 56° | 53° | 71° | 47° | 71° | 41° | 60° | 40° | 57° | 40° | 61° | 36° | 59° | 35° |
| Wind | W 5 to 8 mph | NE 7 mph | NE 6 to 20 mph | NE 10 to 22 mph | NE 6 to 16 mph | NE 7 to 17 mph | E 7 to 12 mph | NE 9 to 14 mph | NE 9 to 13 mph | NE 12 mph | NW 12 to 18 mph | NW 10 to 15 mph | NW 10 mph | SE 5 to 8 mph |
| Gusts | 13 mph | 14 mph | 28 mph | 30 mph | 27 mph | 24 mph | 21 mph | 21 mph | 22 mph | 20 mph | 33 mph | 30 mph | 20 mph | 15 mph |
| Precip % | 9% | 2% | 5% | 28% | 6% | 40% | 32% | 46% | 64% | 73% | 36% | 12% | 3% | 4% |
| Forecast |
No active USGS or USACE telemetry gauge is currently mapped to Angostura Reservoir. Not available from a verified source for this lake.
Good for fishing (87/100), from 5 available inputs. Supporting this: Wind 5 mph from the northeast. 2% chance of precipitation. 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 (94/100), from 4 available inputs. Supporting this: Wind 5 mph from the northeast. 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 (80/100), from 4 available inputs. Supporting this: No active official alerts for this lake. Gusts exceed sustained wind by 8 mph, making the breeze puffy. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Excellent for kayaking (93/100), from 5 available inputs. Supporting this: Wind 5 mph from the northeast. Gusts to 13 mph. 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.
Angostura Reservoir offers an inviting freshwater retreat in SD, overseen by state and local natural resource agencies. Its waters provide ample room for watersports, pontoon cruising, and quiet morning paddle trips along sheltered bays. Staying updated on real-time streamflow and meteorological conditions ensures a smooth trip on the water.
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.
High-speed motorboating, pontoon cruising, wakeboarding, and water skiing across main channels. Target gamefish include Channel Catfish, Green Sunfish, Bluegill, Rock Bass. 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 Angostura 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 11, 4:19 AM MDT