Why is the lake so low? Winter drawdowns explained

Short answer: most lakes that drop in fall are being lowered on purpose. Flood-control lakes are drawn down to a lower winter pool to make room for winter and spring storms, and many hydropower lakes follow a seasonal guide curve that sits lower in winter. Drought is the other big cause: operators must keep releasing water downstream even when little is coming in. Right now 350 of the 498 lakes we track with a published full or summer pool are more than 1 ft below it, including 101 of 173 in the East.

1. Flood-control drawdowns (Army Corps and others)

A flood-control lake is only useful if it has empty space when the storm comes. The Army Corps’ Portland District explains that from September through December it “gradually drains its reservoirs to specific, predetermined levels” to regain flood storage, and that for most of its dams it must keep water low whenever possible from December 1 through January 31 (USACE Portland District). In the Ohio Valley, the Louisville District describes the same idea at C.J. Brown Lake: in fall and winter the lake is kept at a lower “winter pool,” and runoff from heavy rain is stored until the rivers below the dam can take it (USACE Great Lakes and Ohio River Division). The size of the drop varies a lot from lake to lake, from a couple of feet to more than 20.

2. Seasonal guide curves (TVA and many Corps hydropower lakes)

Many lakes don’t aim for one level all year. They follow a guide curve: higher in summer, lower in winter. TVA is the best-known example; its tributary storage lakes fall the furthest. See our TVA winter drawdown guide for every TVA lake’s curve. Here is where the biggest TVA drawdowns stand today:

The Corps uses guide curves too. At Kerr Lake (Buggs Island) on the Virginia–North Carolina line, the Corps’ water control plan keeps the top of the conservation pool at 300 ft but lets the guide curve drop to 295.5 ft in winter for extra flood storage, and sets a normal summer pool of 299.5 ft (USACE Wilmington District, Kerr water control plan). Today Kerr Lake is at 287.9 ft, 7.6 ft below even its winter guide level, so dry weather is adding to the seasonal drop.

3. Utility lakes: Duke Energy, Ameren and others

Duke Energy normally lowers its Catawba-Wateree lakes in winter. For Lake Norman, Duke’s published normal target is 98.5 ft (on its local scale, where 100 ft = full pond) from May through October, 97 ft in November, 96 ft in December and January and 94 ft in February. But this fall is not normal. In an October 19, 2026 notice, Duke said the basin remains in Stage 2 of its drought plan, the Low Inflow Protocol, so “normal seasonal drawdown targets are suspended” and it does not expect to lower Lake Norman or Lake James to their typical winter level of 94.0 ft while Stage 2 is in effect (Duke Energy: Lake Norman). In other words, the Catawba lakes are low because of drought, and Duke is holding water rather than drawing them down.

Ameren Missouri runs an annual winter drawdown at Lake of the Ozarks, lowering the lake to about 654 ft above sea level, roughly 6 ft below its 660-ft full level, to limit spring flooding; the drawdown usually begins in January (Ameren Missouri, Dec. 2025; Ameren Missouri, 2019). Today it is at 657.7 ft. Other utility lakes, such as AEP’s Smith Mountain Lake or Brookfield’s Lake Wallenpaupack, have their own license-based ranges; their pages show the operator’s full level.

4. Drought and low inflow

When rain stops, a lake keeps losing water. Operators still have to release minimum flows downstream for water supply, water quality and fish, and evaporation keeps working. That is why a lake can sit several feet below its guide curve in a dry fall, as the Catawba lakes and Kerr Lake are now. In the West, the big storage reservoirs rise and fall over years with snowpack, so their deficits are measured in tens of feet or more.

The lakes furthest below full pool today

Live data as of Oct 28, 2026. Feet above sea level (or the operator’s datum). “Full / summer pool” is the operator’s published full, normal or summer level. Readings older than 7 days are left out. A big number isn’t always bad news: some of these lakes are in a planned winter drawdown.

East of the Mississippi

Nationwide

For every lake ranked from low to high, plus the biggest moves this week, see lake levels this fall. To understand the different pools, see what full pool means.

What a low lake means for you

• Boat ramps and docks. Ramps that work at summer pool can end in mud. Check your lake page before you tow, and loosen dock cables if you’re on a lake with a planned drawdown.
• Hazards. Stumps, rock piles and sandbars that are deep in summer can sit just under the surface. Run slower in unfamiliar water.
• Fishing. Falling water pushes fish off the banks toward channel edges and deeper points. Low water is also a good time to scout structure you can fish when the lake comes back up.
• Shoreline work. Many operators allow permitted shoreline and dock work during low water; check with your lake’s operator first.

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