Jeff Samsel, FLW press release
Reservoirs get drawn down for a variety of reasons, mostly related to seasonal rains, power production and flood control. On big river systems such as the Tennessee River, where multiple dams impound the main river and various tributaries, it gets complex. The steepness of the terrain and land-use patterns around individual reservoirs also factor into the plan of when the drawdown begins, how quickly the water falls and at what level it ultimately settles.
Understandably, power companies prefer to run water when it can go through generators and produce power. Pouring water over spill gates is like washing money over the dam. Dropping reservoir levels in the fall helps avert flooding from winter storms and heavy spring rains while allowing the companies to run water at beneficial times.
On some impoundments, including Kentucky Lake, the drawdown begins late in the summer and lasts a few months. It’s gradual, therefore, and while water levels continually fluctuate, the general trend is downward from about July to October.
Bass movement begins within the main river channel in late summer. As water temps peak and levels begin to drop, the fish move up onto structure adjacent to ledges. As summer gives way to fall, the same fish move into bays. As fall progresses, the shad and bass tend to head back into the pockets.Because the change is gradual, anglers don’t always expect it to have much impact on the fish’s behavior. But the changing water level definitely does impact the fish’s positioning, just not necessarily in the ways that would be expected.
“Everyone always assumes that when the water goes down, the fish pull back, moving down the same structures into deeper water or moving to deeper structure, but that really doesn’t happen much,” Morehead says. “In fact, as the water is going down in the fall, I’m usually moving farther up into the bays and fishing shallower, instead of the other way around.”
It’s worth noting that the total cause-and-effect of the bass’ fall movements is somewhat hard to pin strictly to the drawdown or any other isolated factor because multiple changes occur at once.
“The water level drops from late summer through fall, but at the same time the shad are moving back in the creeks, and there is usually less current in the river,” Morehead says. “Oxygen levels also play a part. And all the fish in the lake don’t do the same things. While some move into bays, others don’t leave the main river.”
It is also worth noting that impoundments of major rivers like the Tennessee and the Arkansas, where significant current commonly comes into play and where drawdowns are modest, are somewhat distinctive in terms of fish behavior during the fall. In deep tributary reservoirs, which may get drawn down 30 or more feet and where minimal current impacts fish, the bass react differently when water levels go down. They are forced to move to down points or to use deeper humps because flats inside bays get left high and dry from the hard draws.
Disclaimers made, you can often track bass as they react to autumn drawdowns through a series of three temporary pit stops.
1. Bass movement begins within the main river channel late in the summer. As water temperatures peak and levels begin to creep down, the fish move up onto structure adjacent to ledges and often will be a couple of cast’s distance from a break.
“A lot of people think that’s when they go the deepest, but it’s not,” Morehead says. “They actually move shallower, maybe because of cooler water from the current.”
2. As summer gives way to fall, the same fish move into bays, initially positioning themselves along the last breaks in deeper water at the edges of the bays – often suspending, especially if there’s little current. That was where a lot of fish were during Morehead’s EverStart Series Championship win. Others were farther back, but still over shallow bars and their adjacent drops into deeper water.
3. As fall progresses, the shad and the bass tend to work their way farther back to the pockets, first hitting secondary points and bay flats and eventually moving as far back as water levels allow in any bay that’s not overly silted. It’s not a singular migration, though. Some move farther than others, and they also become increasingly scattered as the season progresses.
When bass key on schooling shad and suspend in the water column as they often do during the fall, Morehead hasn’t found anything that does the job better than an Alabama Rig. His EverStart Series Championship win was one of the events that helped introduce this style of rig to the nation’s bass fishermen, but he actually had been experimenting with it for a few months prior to the tournament and already had gained great confidence and competence fishing the then-new rig.
Umbrella rigs mostly get associated with deep fish, but Morehead actually was casting far up into shallow water and swimming a rig quickly with the rod tip high – enough so, even, that one bait would be skipping on top – and a few fish hit the rig as it moved like a buzzbait. He would then slow down the retrieve to work the rig down the slope or swim it over the slope for suspended fish. To find the fish that are most willing to bite, it’s important to swim an umbrella rig through different levels of the water column.
Beyond an umbrella rig, other important lures for Morehead during the fall drawdown include walking-style topwater lures, lipless crankbaits and spinnerbaits. A Spook, which has long been one of Morehead’s go-to lures for this situation, accounted for a couple of important fish on the first day of the EverStart Series Championship.
Major common denominators are that these lures imitate shad effectively, and you can cover water with them. Fish quickly, but pay careful attention to details when you do catch fish. Also watch for the shad at all times, because the fall feed is on during this time.
Like almost any time of year on reservoirs that experience substantial current, moving water is important during the fall drawdown period.
“If you’re going to fish on a lake like this, you had better know that generation schedule by heart,” Morehead says. “The current dictates everything.”
Fall commonly brings steady generation during the week followed by far less flow on Saturday and Sunday, although at times once the lake is low and when rain is slow, extended periods with little current might take hold. Main-lake fish – especially deep main-lake fish – don’t bite nearly as well when the water stops running, which is why anglers focusing exclusively on main-lake ledges commonly bring in massive bags for a day and then disappear from the top of the standings during fall tournaments. It’s also why practice fish often don’t materialize on tournament day.
“If you do see that the water will be running for a few hours in the morning, you might want to start on the main river while there is current, then move in the bays when the water stops.” Morehead adds.
Another important consideration back in the bays is that after generation through the dam at the lower end of a pool ceases, the water level sometimes rises a few inches. It doesn’t look much different on the bank, so conditions seem the same, but the usual result is that bass that have been on the bottom will suspend.
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