Loading page content…
Loading lake conditions…
Gray Reef Reservoir sits in Wyoming and is classified as a reservoir. It covers roughly 182 surface acres. Nearby alternatives include Alcova Reservoir. The page brings together an hourly and 7-day forecast, wind and gust outlook, and activity scores for boating, paddling, and swimming. Current weather, wind, and activity conditions for Gray Reef Reservoir are updated throughout the day.
Updated
Alerts are published by official agencies and shown verbatim. View the official alert source.
Red Flag Warning issued October 9 at 8:43AM MDT until October 9 at 7:00PM MDT by NWS Riverton WY
Overall Poor (52/100) across 4 activities. Best right now: Fishing (67/100).
How the score is calculated →Best good fishing window, averaging 83/100 across these hours. Dusk hours (19:00 local). Sky is partly cloudy (36% cloud cover). Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 80° | 81° | 79° | 77° | 74° | 68° | 66° | 65° | 64° | 62° | 61° | 59° | 58° | 57° | 56° | 55° | 53° | 56° | 60° | 67° | 71° | 75° | 76° | 76° |
| Wind (kts) | 19 | 19 | 17 | 13 | 14 | 14 | 14 | 13 | 15 | 13 | 13 | 12 | 12 | 13 | 14 | 15 | 14 | 14 | 18 | 22 | 23 | 23 | 23 | 24 |
| Direction | W | W | W | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW |
| Gusts (kts) | 28 | 28 | 25 | 20 | 21 | 21 | 21 | 20 | 22 | 19 | 19 | 18 | 18 | 19 | 21 | 22 | 21 | 22 | 28 | 33 | 34 | 35 | 34 | 36 |
| Precip % | 0% | 0% | 0% | 1% | 1% | 1% | 1% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 1% | 1% | 1% | 1% | 1% | 1% | 1% | 1% | 1% | 2% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 3 PM MDT | 80°F | 22 mph WSW (248°) | 32 mph | 0% | 4% | Sunny |
| Fri, 4 PM MDT | 81°F | 22 mph WSW (248°) | 32 mph | 0% | 6% | Sunny |
| Fri, 5 PM MDT | 79°F | 20 mph WSW (248°) | 29 mph | 0% | 4% | Sunny |
| Fri, 6 PM MDT | 77°F | 15 mph SW (225°) | 23 mph | 1% | 17% | Mostly Clear |
| Fri, 7 PM MDT | 74°F | 16 mph SW (225°) | 24 mph | 1% | 36% | Partly Cloudy |
| Fri, 8 PM MDT | 68°F | 16 mph SW (225°) | 24 mph | 1% | 34% | Partly Cloudy |
| Fri, 9 PM MDT | 66°F | 16 mph SW (225°) | 24 mph | 1% | 29% | Partly Cloudy |
| Fri, 10 PM MDT | 65°F | 15 mph SW (225°) | 23 mph | 0% | 37% | Partly Cloudy |
| Fri, 11 PM MDT | 64°F | 17 mph SW (225°) | 25 mph | 0% | 48% | Partly Cloudy |
| Sat, 12 AM MDT | 62°F | 15 mph SW (225°) | 22 mph | 0% | 42% | Partly Cloudy |
| Sat, 1 AM MDT | 61°F | 15 mph SW (225°) | 22 mph | 0% | 21% | Mostly Clear |
| Sat, 2 AM MDT | 59°F | 14 mph SW (225°) | 21 mph | 0% | 19% | Mostly Clear |
| Sat, 3 AM MDT | 58°F | 14 mph SW (225°) | 21 mph | 0% | 18% | Mostly Clear |
| Sat, 4 AM MDT | 57°F | 15 mph SW (225°) | 22 mph | 0% | 25% | Mostly Clear |
| Sat, 5 AM MDT | 56°F | 16 mph SW (225°) | 24 mph | 1% | 25% | Mostly Clear |
| Sat, 6 AM MDT | 55°F | 17 mph SW (225°) | 25 mph | 1% | 30% | Mostly Sunny |
| Sat, 7 AM MDT | 53°F | 16 mph SW (225°) | 24 mph | 1% | 26% | Mostly Sunny |
| Sat, 8 AM MDT | 56°F | 16 mph SW (225°) | 25 mph | 1% | 19% | Sunny |
| Sat, 9 AM MDT | 60°F | 21 mph SW (225°) | 32 mph | 1% | 10% | Sunny |
| Sat, 10 AM MDT | 67°F | 25 mph SW (225°) | 38 mph | 1% | 3% | Sunny |
| Sat, 11 AM MDT | 71°F | 26 mph SW (225°) | 39 mph | 1% | 3% | Sunny |
| Sat, 12 PM MDT | 75°F | 26 mph SW (225°) | 40 mph | 1% | 13% | Sunny |
| Sat, 1 PM MDT | 76°F | 26 mph SW (225°) | 39 mph | 1% | 15% | Sunny |
| Sat, 2 PM MDT | 76°F | 28 mph SW (225°) | 41 mph | 2% | 21% | Sunny |
| Sat, 3 PM MDT | 77°F | 26 mph SW (225°) | 40 mph | 3% | 33% | Mostly Sunny |
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 | This Afternoon 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) | 81° | 52° | 78° | 48° | 68° | 44° | 65° | 37° | 64° | 38° | 59° | 35° | 56° | 31° |
| Wind | WSW 22 mph | SW 14 to 17 mph | SW 16 to 28 mph | SW 15 to 22 mph | SW 10 to 16 mph | SSW 9 to 24 mph | SW 16 to 28 mph | S 5 to 9 mph | SSW 5 to 8 mph | SSW 8 mph | WSW 12 to 16 mph | W 9 mph | NW 10 mph | NW 6 mph |
| Gusts | 32 mph | 25 mph | 41 mph | 32 mph | 30 mph | 47 mph | 45 mph | 20 mph | 20 mph | 17 mph | 29 mph | 21 mph | 23 mph | 15 mph |
| Precip % | 0% | 1% | 8% | 27% | 45% | 87% | 16% | 55% | 46% | 60% | 53% | 44% | 34% | 14% |
| Forecast |
No active USGS or USACE telemetry gauge is currently mapped to Gray Reef Reservoir. Not available from a verified source for this lake.
Fair for fishing (67/100), from 5 available inputs. Supporting this: 0% chance of precipitation. Sky is clear (4% cloud cover). Working against it: Wind 22 mph from the west-southwest. 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.
Poor for boating (37/100), from 4 available inputs. Supporting this: 0% chance of precipitation. Working against it: Active severe alert: Red Flag Warning. Gusts to 32 mph. 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 (58/100), from 4 available inputs. Supporting this: 0% chance of precipitation. Working against it: Active severe alert: Red Flag Warning. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Poor for kayaking (39/100), from 5 available inputs. Supporting this: 0% chance of precipitation. Air temperature 80°F. Working against it: Active severe alert: Red Flag Warning. Gusts to 32 mph. Confidence is high (90%).
Water temperature is not available from a verified source for this lake. No swimming score is shown without it.
Loading interactive map…
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.
Gray Reef Reservoir is an established freshwater reservoir in WY that delivers excellent freshwater boating, fishing, and outdoor recreation. The waterbody's bathymetry and shoreline vegetation provide productive habitat for gamefish year-round. Public recreation areas and boat launch facilities 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.
Low-wake cruising, electric-troll fishing craft, and quiet-water exploration. Target gamefish include 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.
NWS API Web Service · License: U.S. Government work · Attribution: Data provided by the National Weather Service (api.weather.gov)
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 Gray Reef 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, 3:16 PM MDT