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Fontenelle Reservoir is one of the reservoirs LakeRadar tracks in Wyoming. Its recorded surface area is approximately 8,058 acres. Coverage here includes an hourly and 7-day forecast, wind and gust outlook, and activity scores for boating, paddling, and swimming. Nearby alternatives include Big Sandy Reservoir. Forecasts for Fontenelle Reservoir come from the National Weather Service and refresh several times a day.
Updated
No active alerts for this lake as of the last check (Oct 11, 11:09 AM MDT). Alerts are re-checked automatically; see the official source for updates.
Overall Poor (53/100) across 4 activities. Best right now: Sailing (63/100).
How the score is calculated →| Metric | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 52° | 55° | 56° | 57° | 58° | 58° | 57° | 56° | 55° | 54° | 54° | 52° | 50° | 49° | 48° | 46° | 45° | 43° | 41° | 38° | 40° | 43° | 45° | 47° |
| Wind (kts) | 9 | 10 | 14 | 16 | 16 | 17 | 17 | 17 | 18 | 21 | 19 | 20 | 23 | 19 | 17 | 15 | 13 | 10 | 7 | 5 | 4 | 4 | 7 | 7 |
| Direction | SE | SE | S | S | S | S | S | S | S | S | S | SW | SW | W | SW | W | W | W | W | W | W | S | S | S |
| Gusts (kts) | 14 | 17 | 23 | 26 | 26 | 27 | 27 | 27 | 30 | 33 | 30 | 33 | 37 | 31 | 27 | 25 | 20 | 16 | 11 | 9 | 7 | 7 | 11 | 11 |
| Precip % | 55% | 61% | 59% | 45% | 45% | 49% | 47% | 53% | 52% | 62% | 29% | 25% | 18% | 30% | 22% | 27% | 12% | 22% | 65% | 56% | 54% | 55% | 75% | 51% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Sun, 11 AM MDT | 52°F | 10 mph SE (135°) | 16 mph | 55% | 93% | Showers And Thunderstorms Likely |
| Sun, 12 PM MDT | 55°F | 12 mph SE (135°) | 20 mph | 61% | 92% | Showers And Thunderstorms Likely |
| Sun, 1 PM MDT | 56°F | 16 mph SSE (158°) | 27 mph | 59% | 77% | Showers And Thunderstorms Likely |
| Sun, 2 PM MDT | 57°F | 18 mph SSE (158°) | 30 mph | 45% | 78% | Chance Showers And Thunderstorms |
| Sun, 3 PM MDT | 58°F | 18 mph S (180°) | 30 mph | 45% | 80% | Chance Showers And Thunderstorms |
| Sun, 4 PM MDT | 58°F | 20 mph S (180°) | 31 mph | 49% | 76% | Chance Showers And Thunderstorms |
| Sun, 5 PM MDT | 57°F | 20 mph S (180°) | 31 mph | 47% | 68% | Chance Showers And Thunderstorms |
| Sun, 6 PM MDT | 56°F | 20 mph S (180°) | 31 mph | 53% | 78% | Chance Showers And Thunderstorms |
| Sun, 7 PM MDT | 55°F | 21 mph S (180°) | 35 mph | 52% | 84% | Chance Showers And Thunderstorms |
| Sun, 8 PM MDT | 54°F | 24 mph S (180°) | 38 mph | 62% | 93% | Showers And Thunderstorms Likely |
| Sun, 9 PM MDT | 54°F | 22 mph S (180°) | 35 mph | 29% | 89% | Chance Showers And Thunderstorms |
| Sun, 10 PM MDT | 52°F | 23 mph SSW (203°) | 38 mph | 25% | 85% | Chance Showers And Thunderstorms |
| Sun, 11 PM MDT | 50°F | 26 mph SW (225°) | 43 mph | 18% | 91% | Slight Chance Showers And Thunderstorms |
| Mon, 12 AM MDT | 49°F | 22 mph WSW (248°) | 36 mph | 30% | 80% | Chance Rain Showers |
| Mon, 1 AM MDT | 48°F | 20 mph SW (225°) | 31 mph | 22% | 79% | Slight Chance Rain Showers |
| Mon, 2 AM MDT | 46°F | 17 mph WSW (248°) | 29 mph | 27% | 68% | Chance Rain Showers |
| Mon, 3 AM MDT | 45°F | 15 mph WSW (248°) | 23 mph | 12% | 56% | Mostly Cloudy |
| Mon, 4 AM MDT | 43°F | 12 mph WSW (248°) | 18 mph | 22% | 74% | Slight Chance Rain Showers |
| Mon, 5 AM MDT | 41°F | 8 mph WSW (248°) | 13 mph | 65% | 82% | Rain Showers Likely |
| Mon, 6 AM MDT | 38°F | 6 mph WSW (248°) | 10 mph | 56% | 86% | Rain Showers Likely |
| Mon, 7 AM MDT | 40°F | 5 mph W (270°) | 8 mph | 54% | 92% | Chance Rain Showers |
| Mon, 8 AM MDT | 43°F | 5 mph S (180°) | 8 mph | 55% | 98% | Rain Showers Likely |
| Mon, 9 AM MDT | 45°F | 8 mph S (180°) | 13 mph | 75% | 99% | Showers And Thunderstorms |
| Mon, 10 AM MDT | 47°F | 8 mph S (180°) | 13 mph | 51% | 88% | Chance Showers And Thunderstorms |
| Mon, 11 AM MDT | 50°F | 12 mph SSW (203°) | 18 mph | 38% | 56% | 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 11, 2026 | Tonight 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 | Saturday October 17, 2026 | Saturday Night October 17, 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 58° | 38° | 56° | 34° | 52° | 30° | 50° | 28° | 54° | 27° | 54° | 26° | 60° | 29° |
| Wind | SSE 10 to 20 mph | SW 8 to 26 mph | SW 5 to 14 mph | ESE 8 mph | SE 6 to 9 mph | NW 8 to 13 mph | E 5 to 8 mph | W 7 mph | SW 3 mph | ESE 7 mph | ENE 6 mph | NNE 3 mph | WNW 1 to 5 mph | W 7 mph |
| Gusts | 31 mph | 43 mph | 23 mph | 13 mph | 16 mph | 17 mph | 13 mph | 10 mph | 8 mph | 9 mph | 9 mph | 5 mph | 12 mph | 12 mph |
| Precip % | 61% | 65% | 85% | 93% | 81% | 81% | 55% | 26% | 3% | 3% | 0% | 1% | 1% | 0% |
| Forecast |
No active USGS or USACE telemetry gauge is currently mapped to Fontenelle Reservoir. Not available from a verified source for this lake.
Nearby river temperature: 59.0°F at GREEN RIVER BELOW FONTENELLE RESERVOIR, WY (1.5 mi away) · Oct 11, 11:00 AM UTC
Poor for fishing (45/100), from 5 available inputs. Supporting this: Wind 10 mph from the southeast. Sky is overcast (93% cloud cover). 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 (55/100), from 4 available inputs. Supporting this: No active official alerts for this lake. Wind 10 mph from the southeast. 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 (63/100), from 4 available inputs. Supporting this: Wind 10 mph from the SE 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 (55/100), from 5 available inputs. Supporting this: Wind 10 mph from the southeast. No active official alerts for this lake. 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.
As a core recreational asset in WY, Fontenelle Reservoir draws water enthusiasts for angling, paddling, and watersports throughout the season. Its diverse shoreline features public parks, boat launches, and scenic day-use areas overseen by state and local natural resource agencies. Please respect designated no-wake zones and wildlife preservation areas.
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, Kokanee Salmon, Mountain Whitefish, Brook 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 Fontenelle 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, 11:09 AM MDT