Fall 2026 Lake Level Update

LETTER FROM CLYDE MORRIS, LLA VICE PRESIDENT AND SECRETARY

We know many of you have questions and concerns about Lake Lanier’s current water levels. With the lake continuing to fall, it’s understandable to wonder why that is happening after periods of significant rainfall and when the U.S. Army Corps of Engineers (Corps) will begin storing water again.

We wanted to take a closer look at the numbers and share what we know so that our members and the Lake Lanier community have a clearer picture of what is happening.

The precipitation data creates an interesting question. According to our sources, rainfall in the Lanier basin was below average for the period of June through August this year, and Gainesville itself was about 18% below average. If not for the above-average rainfall we received in May and July, Lanier would be significantly lower than its current level. Here are the numbers:

So this past summer did not bring us a surplus of rain; in fact, May and July are the only months with above-normal rainfall so far this year. More importantly, there is a larger picture that is even more daunting. 

We entered the year in a serious drought and have had only sporadic relief. Using data from the NWS Gainesville, Georgia station, during the period from August 1, 2024 through August 31, 2026, we had the following rainfall:

As you can see, over those 25 months Gainesville received about 92.2 inches of rain when roughly 111.4 inches would normally be expected—a cumulative deficit of approximately 19.3 inches, or 17% below normal. During that period, we had one particularly notable deviation: September 2024 rainfall jumped to 10.22″ largely because of Hurricane Helene, and October recorded only a trace. (National Weather Service) (As an interesting sidenote, Lanier has historically relied on tropical system precipitation for a substantial portion of its inflows; sort of a yin-yang balance between droughts and tropical systems that have contributed to the basin’s historical experience.)

The year-by-year progression is particularly revealing: late 2024 was only modestly below normal overall because September’s 10.22″ compensated for other dry months; 2025 accumulated roughly a 10.4-inch deficit; and January–August 2026 added another roughly 8.1-inch deficit. (National Weather Service)

So, what we have experienced over the past two years can reasonably be viewed as a prolonged drought-like pattern interrupted by a few unusually wet months. Those episodes of heavy rainfall have periodically replenished Lake Lanier and masked the severity of the underlying cumulative rainfall deficit. Without them, the lake would be substantially lower today. The experience of 2007 – when a multi-year drought drove the lake to its historic low of 1050.79 feet – demonstrates the potential consequences when an extended rainfall deficit persists without sufficient periods of recharge.

Let’s turn back to the questions many of you have about why the lake level is continuing to fall and at what level the Corps will start refilling. The Corps is releasing the minimum amount required to support downstream flows, meaning water supply intakes downstream of the dam and the water quality minimum of 750 cfs at Peachtree Creek. Lake inflows are very low and have averaged only 338 cfs so far this month, compared to the required discharges that have averaged 1230 cfs, for a deficit of 892 cfs per day. That, in a nutshell, is why the lake is dropping so quickly.

As for the level at which the Corps will start refilling, there is not a simple answer, but the answer is in the ACF Water Control Manual and depends on a lot of variables. The Corps is forecasting that composite storage in the entire ACF system will continue to decline, approaching Zone 3 around November 1. If it actually drops into Zone 3 by October 31, then Drought Operations will go into effect November 1, allowing the Corps to store essentially all basin inflow above the minimum flow of 5,000 cfs required at Jim Woodruff Dam near the Florida state line. Otherwise, beginning December 1, the winter operating rules allow the Corps to store essentially all basin inflow above the 5,000-cfs minimum through February.

This is probably a lot more information than you expected, but we hope it helps illustrate that the often-mentioned theories about the Corps “drawing down” the lake for winter and “refilling it” in the spring are relics of a time before the Water Control Manual went into effect. The reality is much more complex, but even so, it’s Mother Nature who is really pulling the strings, not the Corps.