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John W. Flannagan Reservoir is one of the reservoirs LakeRadar tracks in Virginia. The water surface spans about 1,143 acres, making it a mid-sized body of water. Fish documented in the area include Smallmouth Bass, Bluegill, Warmouth, and Black Crappie. A nearby water gauge supplies level and temperature readings where available. If you are planning a trip, Fishtrap Lake are also nearby. Coverage here includes an hourly and 7-day forecast, wind and gust outlook, water readings, fishing conditions, and activity scores for boating, paddling, and swimming. Forecasts for John W. Flannagan 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, 7:20 PM EDT). Alerts are re-checked automatically; see the official source for updates.
Overall Good (78/100) across 4 activities. Best right now: Sailing (80/100).
How the score is calculated →Best excellent fishing window, averaging 94/100 across these hours. Wind 1 mph from the southwest. Dusk hours (19:00 local). Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 62° | 62° | 61° | 61° | 61° | 60° | 60° | 60° | 60° | 59° | 59° | 57° | 58° | 58° | 58° | 61° | 64° | 67° | 71° | 73° | 74° | 75° | 75° | 72° |
| Wind (kts) | 8 | 8 | 7 | 8 | 8 | 8 | 8 | 7 | 6 | 6 | 6 | 6 | 6 | 5 | 6 | 6 | 6 | 5 | 5 | 4 | 4 | 4 | 3 | 2 |
| Direction | W | W | W | W | W | W | W | W | W | W | W | NW | NW | W | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW |
| Gusts (kts) | 16 | 15 | 16 | 16 | 16 | 15 | 15 | 16 | 16 | 15 | 16 | 15 | 14 | 13 | 12 | 12 | 11 | 10 | 9 | 9 | 8 | 8 | 7 | 5 |
| Precip % | 82% | 94% | 99% | 97% | 87% | 90% | 72% | 69% | 53% | 50% | 43% | 22% | 16% | 14% | 13% | 2% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Sun, 7 PM EDT | 62°F | 9 mph W (270°) | 18 mph | 82% | 91% | Rain Showers |
| Sun, 8 PM EDT | 62°F | 9 mph W (270°) | 17 mph | 94% | 96% | Rain Showers |
| Sun, 9 PM EDT | 61°F | 8 mph W (270°) | 18 mph | 99% | 100% | Rain Showers |
| Sun, 10 PM EDT | 61°F | 9 mph W (270°) | 18 mph | 97% | 98% | Rain Showers |
| Sun, 11 PM EDT | 61°F | 9 mph W (270°) | 18 mph | 87% | 93% | Rain Showers |
| Mon, 12 AM EDT | 60°F | 9 mph W (270°) | 17 mph | 90% | 94% | Rain Showers |
| Mon, 1 AM EDT | 60°F | 9 mph W (270°) | 17 mph | 72% | 94% | Chance Rain Showers |
| Mon, 2 AM EDT | 60°F | 8 mph W (270°) | 18 mph | 69% | 95% | Rain Showers Likely |
| Mon, 3 AM EDT | 60°F | 7 mph W (270°) | 18 mph | 53% | 94% | Chance Rain Showers |
| Mon, 4 AM EDT | 59°F | 7 mph W (270°) | 17 mph | 50% | 98% | Chance Rain Showers |
| Mon, 5 AM EDT | 59°F | 7 mph W (270°) | 18 mph | 43% | 95% | Chance Rain Showers |
| Mon, 6 AM EDT | 57°F | 7 mph NW (315°) | 17 mph | 22% | 94% | Patchy Fog |
| Mon, 7 AM EDT | 58°F | 7 mph NW (315°) | 16 mph | 16% | 93% | Patchy Fog |
| Mon, 8 AM EDT | 58°F | 6 mph W (270°) | 15 mph | 14% | 89% | Patchy Fog |
| Mon, 9 AM EDT | 58°F | 7 mph NW (315°) | 14 mph | 13% | 89% | Patchy Fog |
| Mon, 10 AM EDT | 61°F | 7 mph NW (315°) | 14 mph | 2% | 92% | Cloudy |
| Mon, 11 AM EDT | 64°F | 7 mph NW (315°) | 13 mph | 0% | 79% | Mostly Cloudy |
| Mon, 12 PM EDT | 67°F | 6 mph NW (315°) | 12 mph | 0% | 75% | Mostly Cloudy |
| Mon, 1 PM EDT | 71°F | 6 mph NW (315°) | 10 mph | 0% | 68% | Partly Sunny |
| Mon, 2 PM EDT | 73°F | 5 mph NW (315°) | 10 mph | 0% | 42% | Mostly Sunny |
| Mon, 3 PM EDT | 74°F | 5 mph NW (315°) | 9 mph | 0% | 41% | Mostly Sunny |
| Mon, 4 PM EDT | 75°F | 5 mph NW (315°) | 9 mph | 0% | 42% | Mostly Sunny |
| Mon, 5 PM EDT | 75°F | 3 mph NW (315°) | 8 mph | 0% | 51% | Partly Sunny |
| Mon, 6 PM EDT | 72°F | 2 mph NW (315°) | 6 mph | 0% | 57% | Mostly Cloudy |
| Mon, 7 PM EDT | 68°F | 1 mph SW (225°) | 5 mph | 0% | 40% | Partly Cloudy |
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 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) | 70° | 56° | 75° | 54° | 83° | 57° | 84° | 60° | 79° | 59° | 74° | 38° | 53° | 30° |
| Wind | W 9 mph | W 9 mph | NW 3 to 7 mph | SW 1 to 5 mph | SW 7 mph | SW 6 mph | SW 6 mph | SW 5 mph | W 5 mph | S 3 to 9 mph | W 9 to 15 mph | NW 16 mph | NW 16 mph | N 2 to 13 mph |
| Gusts | 20 mph | 20 mph | 17 mph | 9 mph | 13 mph | 12 mph | 10 mph | 8 mph | 9 mph | 13 mph | 22 mph | 24 mph | 22 mph | 18 mph |
| Precip % | 52% | 99% | 22% | 0% | 0% | 0% | 4% | 18% | 21% | 21% | 63% | 63% | 13% | 4% |
| Forecast |
No active USGS or USACE telemetry gauge is currently mapped to John W. Flannagan Reservoir. Not available from a verified source for this lake.
Good for fishing (78/100), from 5 available inputs. Supporting this: Wind 9 mph from the west. Dusk hours (19:00 local). Working against it: 82% chance of precipitation is likely. 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.
Good for boating (76/100), from 4 available inputs. Supporting this: Wind 9 mph from the west. No active official alerts for this lake. Working against it: 82% chance of precipitation is likely. 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: Wind 9 mph from the W is in the preferred sailing range. No active official alerts for this lake. Working against it: 82% chance of precipitation is likely. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Good for kayaking (77/100), from 5 available inputs. Supporting this: Wind 9 mph from the west. No active official alerts for this lake. Working against it: 82% chance of precipitation is likely. 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 VA Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
Surrounded by VA's distinct outdoor landscape, John W. Flannagan Reservoir is an active freshwater reservoir catering to fishermen, pleasure boaters, and nature observers. Its diverse depths and shoreline contours create productive fishing structure across all seasons. Review current launch fees and facility operating schedules before traveling.
Valid freshwater sport fishing license issued by Virginia Department of Wildlife Resources (DWR) 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 Smallmouth Bass, Bluegill, Warmouth, Black Crappie. 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.
Mild year-round outdoor climate. Uncrowded waters, active winter bass and crappie fishing, and open year-round boat launch access.
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 John W. Flannagan 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, 7:20 PM EDT