On the morning of November 22, 2025, on the exposed mudflats of Lake Barkley about twelve kilometres south of the lock and dam at Grand Rivers, Kentucky, an observer with a spotting scope counted four thousand seven hundred and twelve dabbling ducks across about six hundred metres of shoreline.
The mix was roughly fifty percent gadwall, thirty percent American wigeon, ten percent green-winged teal, and the balance northern pintail, northern shoveler, and a handful of late blue-winged teal. The mudflat had been underwater on October 1 and was scheduled to be underwater again by March.
This is the seasonal pattern of Lake Barkley and its sister reservoir Kentucky Lake, both managed by the U.S. Army Corps of Engineers as part of the Tennessee Valley flood-control and navigation system. The reservoirs operate on a summer-pool, winter-pool cycle, with water levels drawn down each autumn by about two metres to provide flood storage for winter rains.
The drawdown exposes thousands of hectares of mudflat across the two reservoirs. The mudflat, given a few weeks of warm autumn weather, produces a flush of moist-soil vegetation: smartweed, panicgrass, wild millet, sedges. The vegetation goes to seed before the first hard freeze. The seed is what the ducks come for.
This is, in functional terms, one of the largest moist-soil management systems on the continent. It is not managed for waterfowl. It is managed for water. The waterfowl response is incidental.
Pell Murphy spent the second week of November 2025 working the Lake Barkley shoreline with biologists from the Kentucky Department of Fish and Wildlife Resources, who have been running long-term aerial waterfowl surveys on the reservoir since 1989.
The headline finding from the multi-decade data set is that Lake Barkley and Kentucky Lake now collectively support some of the largest wintering concentrations of dabbling ducks anywhere in the Mississippi Flyway interior, with peak counts in some years exceeding two hundred and fifty thousand birds.
This was not the case in the 1970s. The reservoirs had been built in the 1960s, and the waterfowl response in the first two decades was modest. The shift began in the late 1980s and accelerated through the 1990s and 2000s as the natural moist-soil community on the exposed mudflats matured and as Mississippi Flyway populations of gadwall and wigeon recovered.
The trajectory has been the opposite of what was happening in the same period on the historic wintering grounds of the lower Mississippi Alluvial Valley. The bottomland hardwood forests of Arkansas and Mississippi, which had supported continental waterfowl populations for ten thousand years, were being cleared, drained, and converted to row-crop agriculture at high speed.
The reservoirs, in effect, picked up some of the slack. The ducks moved to where the food was.
This is not a story of restoration. The Tennessee Valley reservoirs are heavily engineered impoundments that drowned native riverine and floodplain habitat across hundreds of thousands of hectares. The waterfowl response is a partial, incidental compensation for a much larger ecological transformation.
It is also, taken on its own terms, one of the more important pieces of inland waterfowl habitat in North America, and almost entirely a product of how the dams happen to be operated rather than of any conservation design.
There is a vulnerability here. The drawdown schedule is set by Corps engineers based on flood-control criteria, navigation requirements, and hydropower generation needs. It is not set with the waterfowl in mind.
If the schedule were changed, even modestly, in ways that delayed the autumn drawdown or shortened the exposure period, the moist-soil community would not have time to produce seed and the waterfowl resource would collapse within a season or two.
The Tennessee Valley Authority and the Corps have, in recent years, become more aware of the waterfowl value of the current schedule, partly through engagement with state wildlife agencies and partly through the work of the Lower Mississippi Valley Joint Venture. The schedule has been formally protected in current operating documents.
Whether it remains protected through future updates to the operating manuals, which are revised on roughly twenty-year cycles, is a question for the next decade.
Murphy's interest in the Lake Barkley system, beyond the spectacle of the ducks themselves, is what the reservoir model implies for other inland systems. The Wabash, the upper Ohio, several Appalachian flood-control reservoirs, and a number of large prairie impoundments could in principle produce similar moist-soil resources if their drawdown schedules were tuned even modestly to allow autumn seed set on exposed mudflats.
A few have been tuned this way, mostly on state and federal wildlife refuges. Most have not.
The Lake Barkley case is, in this sense, both an existence proof and an argument for replication. The existence proof is that an engineered reservoir, operated on a particular hydrologic schedule, can produce continental-scale waterfowl habitat. The argument for replication is that other reservoirs could do similar work, at modest hydrologic cost, if operating agencies were willing to consider it.
On the afternoon of November 24, 2025, the count at Murphy's section of shoreline was up to roughly seven thousand birds. A bald eagle drifted over from the timbered bluff behind the lake and the ducks lifted in a single sheet, settled again, kept feeding.
Murphy noted in his book that the eagle, too, was a beneficiary of the same accidental design. It had not been on the lake in his childhood. It was there now because the ducks were.
