Each spring, the identical query nags warmwater fly anglers from Oklahoma to Ohio: Is it taking place but? Are the largemouth transferring shallow? Have the pike pushed into the backwaters? Is it value burning a trip day, or will you spend six hours casting into useless water?
Most of us reply these questions the old style means—scrolling via discussion board posts, texting fishing buddies, or just driving to the water and hoping. However there’s a greater strategy, and it’s been hiding in plain sight: the US Geological Survey’s community of greater than 12,000 streamgages, which tracks river situations in close to actual time throughout the nation.
Streamflow is the most typical measurement within the community, however many websites additionally document water temperature. Collectively, these two variables—temperature development and discharge stability—are the closest factor a warmwater fly angler can get to a crystal ball in February and March. A single heat afternoon means little or no to a largemouth bass; what issues is whether or not a warming development held in a single day or collapsed after sundown, and whether or not the river has settled sufficient for fish to carry within the shallows. USGS hydrographs present you each.
The strategy works no matter latitude. Within the Deep South, largemouth bass can start prespawn motion as early as January, and by mid-February anglers in states like Georgia, Alabama, Oklahoma, and Texas might already be behind the curve. The Oklahoma Department of Wildlife Conservation identifies February and March because the prespawn months for largemouth in that state—the window when the most important bass of the 12 months are most catchable. Farther north, smallmouth anglers and pike chasers within the Midwest are watching for various thresholds on a later calendar—however studying the identical gages in the identical means.
We’ve put collectively a full information that walks via the system step-by-step: tips on how to decide the fitting gages to your water, what graph shapes to look at for, which temperature thresholds set off prespawn exercise for various species and areas, tips on how to arrange automated alerts so that you by no means miss the primary window, and tips on how to pair all of it with mapping instruments that resolve the entry drawback. Whether or not you’re watching a gage on the Chattahoochee in February or the Grand River in April, studying to learn this knowledge could also be the perfect funding you make this season.
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