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Big Sandy Reservoir is a reservoir located in Wyoming. It covers roughly 2,919 surface acres (about 5 square miles). Research-grade observations nearby include Brown Trout. Other waters in the region include Fremont Lake. The page brings together an hourly and 7-day forecast, wind and gust outlook, fishing conditions, and activity scores for boating, paddling, and swimming. Current weather, wind, and activity conditions for Big Sandy 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 9, 11:54 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 Fair (58/100) across 4 activities. Best right now: Sailing (71/100).
How the score is calculated →Best good fishing window, averaging 86/100 across these hours. Wind 12 mph from the southwest. Dusk hours (19:00 local). Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 68° | 70° | 72° | 73° | 71° | 70° | 67° | 60° | 56° | 54° | 52° | 50° | 48° | 48° | 47° | 46° | 45° | 45° | 43° | 45° | 50° | 58° | 62° | 65° |
| Wind (kts) | 11 | 13 | 15 | 16 | 16 | 11 | 10 | 11 | 11 | 11 | 12 | 11 | 10 | 10 | 9 | 9 | 10 | 10 | 10 | 10 | 13 | 16 | 18 | 19 |
| Direction | SW | W | W | W | W | W | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW |
| Gusts (kts) | 16 | 20 | 22 | 23 | 24 | 17 | 14 | 17 | 17 | 17 | 18 | 17 | 15 | 15 | 13 | 14 | 15 | 15 | 15 | 15 | 20 | 24 | 28 | 28 |
| Precip % | 0% | 0% | 1% | 1% | 2% | 2% | 2% | 3% | 3% | 6% | 10% | 13% | 13% | 13% | 13% | 9% | 6% | 2% | 3% | 3% | 4% | 6% | 6% | 38% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 1 PM MDT | 68°F | 13 mph SW (225°) | 18 mph | 0% | 2% | Sunny |
| Fri, 2 PM MDT | 70°F | 15 mph WSW (248°) | 23 mph | 0% | 4% | Sunny |
| Fri, 3 PM MDT | 72°F | 17 mph WSW (248°) | 25 mph | 1% | 10% | Sunny |
| Fri, 4 PM MDT | 73°F | 18 mph WSW (248°) | 27 mph | 1% | 27% | Mostly Sunny |
| Fri, 5 PM MDT | 71°F | 18 mph WSW (248°) | 28 mph | 2% | 34% | Mostly Sunny |
| Fri, 6 PM MDT | 70°F | 13 mph WSW (248°) | 20 mph | 2% | 43% | Partly Cloudy |
| Fri, 7 PM MDT | 67°F | 12 mph SW (225°) | 16 mph | 2% | 42% | Partly Cloudy |
| Fri, 8 PM MDT | 60°F | 13 mph SSW (203°) | 20 mph | 3% | 25% | Mostly Clear |
| Fri, 9 PM MDT | 56°F | 13 mph SSW (203°) | 20 mph | 3% | 21% | Mostly Clear |
| Fri, 10 PM MDT | 54°F | 13 mph SSW (203°) | 20 mph | 6% | 16% | Mostly Clear |
| Fri, 11 PM MDT | 52°F | 14 mph SSW (203°) | 21 mph | 10% | 31% | Partly Cloudy |
| Sat, 12 AM MDT | 50°F | 13 mph SSW (203°) | 20 mph | 13% | 41% | Partly Cloudy |
| Sat, 1 AM MDT | 48°F | 12 mph SSW (203°) | 17 mph | 13% | 62% | Mostly Cloudy |
| Sat, 2 AM MDT | 48°F | 12 mph SSW (203°) | 17 mph | 13% | 69% | Mostly Cloudy |
| Sat, 3 AM MDT | 47°F | 10 mph SSW (203°) | 15 mph | 13% | 74% | Mostly Cloudy |
| Sat, 4 AM MDT | 46°F | 10 mph SSW (203°) | 16 mph | 9% | 70% | Mostly Cloudy |
| Sat, 5 AM MDT | 45°F | 12 mph SSW (203°) | 17 mph | 6% | 59% | Mostly Cloudy |
| Sat, 6 AM MDT | 45°F | 12 mph SSW (203°) | 17 mph | 2% | 64% | Partly Sunny |
| Sat, 7 AM MDT | 43°F | 12 mph SSW (203°) | 17 mph | 3% | 66% | Partly Sunny |
| Sat, 8 AM MDT | 45°F | 12 mph SSW (203°) | 17 mph | 3% | 70% | Mostly Cloudy |
| Sat, 9 AM MDT | 50°F | 15 mph SSW (203°) | 23 mph | 4% | 65% | Partly Sunny |
| Sat, 10 AM MDT | 58°F | 18 mph SW (225°) | 28 mph | 6% | 49% | Mostly Sunny |
| Sat, 11 AM MDT | 62°F | 21 mph SW (225°) | 32 mph | 6% | 33% | Mostly Sunny |
| Sat, 12 PM MDT | 65°F | 22 mph SW (225°) | 32 mph | 38% | 40% | Chance Showers And Thunderstorms |
| Sat, 1 PM MDT | 66°F | 22 mph SW (225°) | 32 mph | 51% | 32% | Chance Showers And Thunderstorms |
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 | Today October 9, 2026 | Tonight 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 | Thursday Night October 15, 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 73° | 43° | 67° | 40° | 59° | 38° | 58° | 32° | 55° | 29° | 52° | 27° | 53° | 25° |
| Wind | SW 8 to 18 mph | SW 10 to 14 mph | SW 8 to 22 mph | S 7 to 16 mph | S 9 to 15 mph | S 15 to 24 mph | SW 9 to 14 mph | SSE 6 mph | SE 8 mph | ENE 9 mph | WNW 9 mph | WNW 7 to 10 mph | WNW 5 mph | NNW 5 mph |
| Gusts | 28 mph | 21 mph | 32 mph | 24 mph | 28 mph | 40 mph | 28 mph | 14 mph | 18 mph | 17 mph | 21 mph | 21 mph | 14 mph | 13 mph |
| Precip % | 2% | 13% | 64% | 85% | 94% | 83% | 59% | 66% | 56% | 58% | 46% | 27% | 9% | 7% |
| Forecast |
Poor for fishing (52/100), from 5 available inputs. Supporting this: Wind 13 mph from the southwest. 0% chance of precipitation. The forecast mentions thunderstorms, which carries a risk penalty. 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.
Fair for boating (57/100), from 4 available inputs. Supporting this: No active official alerts for this lake. Wind 13 mph from the southwest. The forecast mentions thunderstorms, which carries a risk penalty. 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.
Fair for sailing (71/100), from 4 available inputs. Supporting this: Wind 13 mph from the SW is in the preferred sailing range. No active official alerts for this lake. The forecast mentions thunderstorms, which carries a risk penalty. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Fair for kayaking (57/100), from 5 available inputs. Supporting this: No active official alerts for this lake. Wind 13 mph from the southwest. The forecast mentions thunderstorms, which carries a risk penalty. 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 WY Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
Big Sandy Reservoir serves WY as a major recreational venue, featuring well-maintained boat ramps, picnic facilities, and scenic waterfront views. Whether casting for bass or cruising the main basin with family, visitors find ample opportunities to enjoy the water. Stewardship and oversight are overseen by state and local natural resource agencies.
Valid freshwater sport fishing license issued by Wyoming Game and Fish Department (WGFD) is required for anglers age 14+. Digital license on mobile is accepted.
Mandatory Clean, Drain & Dry inspection. Out-of-area craft require on-site Aquatic Invasive Species (AIS Quagga/Zebra) inspection or decontamination before launch. USCG life jackets required for all.
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 Brown 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 Big Sandy 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, 1:25 PM MDT