The Missouri River reservoirs in South Dakota are complex and dynamic fisheries, and one of the biggest factors in both angling techniques and locations is seasonal movements of fish throughout the waterbody. This brings an added factor in locating fish that takes an understanding of these movements throughout the calendar year.
Reservoirs, including the Missouri River reservoirs in South Dakota of Lake Oahe, Lake Sharpe, Lake Francis Case, and Lewis and Clark Lake, have different characteristics throughout the waterbody. These reservoirs can be most easily broken down into thirds, with an upper, middle, and lower portion.
Breaking Down a Missouri River Reservoir
The upper end of these reservoirs features riverine elements, with shallower depths, faster current, and more traditional sandbars and other shallow structures. Current has a greater impact on the bite in this area and generally speaking while it is present submerged timber and vegetation is often decreased.
Good examples of the upper end of popular reservoirs would be the Crow Creek area on Lake Francis Case, as well as the Antelope Island area on Lake Sharpe. Two popular “town” areas of both Chamberlain and Pierre also present classic riverine sections on the upper end of Lake Francis Case and Lake Sharpe respectively.
The middle section is a transitional area, featuring current but also increasing flooded timber and other submerged structures. Deeper water will begin to present itself as well, and elements of both riverine and lake styles will be present. Larger tributaries also are often present in these areas.
Good examples of the middle areas of popular reservoirs would be the Platte area of Lake Francis Case, which includes the Snake Creek and Platte Creek areas. Joe Creek is a good example on Lake Sharpe. The area between Whitlock Bay, Sutton Bay, and Bushes Landing are excellent examples on Lake Oahe.
The lower end of the reservoirs act more as a lake. There is minimal current, deeper water, and generally speaking cooler water in the summer months as well. Submerged timber and other vegetation is also more prominent in these areas.
Good examples of the lower end of popular reservoirs would be West Bend on Lake Sharpe, North Point on Lake Francis Case, and Spring Creek on Lake Oahe. These areas have deeper, cooler water and minimal if any current.
These three elements all have distinct purposes when it comes to walleye movements throughout the calendar year. While some walleye may stay in one area of the reservoir throughout most of the year, for the most part the bulk of the walleye population will utilize the entire end of the reservoir.
In the spring time, the focus is on spawning. The presence of both current and quality spawning structure will attract fish to this area as they complete their annual spawning rituals. Rocky and gravel shorelines, as well as the high river bluffs, all present quality spawning habitat.
Once the spawn is complete, fish will begin to move throughout the reservoir. Many of them will move back downriver and seek the deeper, cooler water in the lower end of the reservoir for comfort in the summer. They will often stop in the transitional areas, using the large flats and other structure to feed as they both recover from spawn and make their way downriver.
Generally speaking, anglers can expect to find fish in the upper end of the reservoirs March through early May, before transitioning down river through May and June. July through September fish will be primarily on the lower end of the reservoir. Fish will then begin moving back up into the upper third late September into October and the rest of the season.
Studies Showcase Seasonal Movements
A strong case study for these movements comes from Lake Francis Case tagging information. Jaw tags are placed in walleyes, and anglers then report the tag number and location of harvest as these fish are caught.
In the upper end of the reservoir, tag return percentages are highest in April and October. In the lower end of the reservoir, tag return percentages are highest in September. Subsequently, September saw the lowest tag return percentage in the upper end of the reservoir.
To further reiterate this, gill net surveys are conducted in September. On Lake Francis Case, the highest catch rates are often from the middle to the lower end of the reservoir. An example of this was shared in the 2026 Lake Francis Case walleye update.
Gill net surveys take place in September, and provide a snapshot of the fishery. At the time of sampling, the best net catches were mainly from the Boyer to Whetstone Bay area, which is primarily the central part of the reservoir. While fish were caught throughout the entire reservoir, at this time, the upper end of the reservoir had the fewest fish.
Learn More: Lake Francis Case Walleye Population Continues Positive Trend
A similar trend is also present for walleye populations in the Oahe Dam tailrace at the upper end of Lake Sharpe. Walleye present in the tailrace area will be present at relatively low numbers in May, slightly increasing in June and July. Beginning in August, walleye numbers will begin to significantly increase before nearly doubling in September. An example of this was shared in the 2026 Lake Sharpe walleye update.
May is often the lowest amount of walleyes observed, with fish per kilometer less than 5. June sees an increase of fish, up to about 10 walleyes per kilometer, with July numbers very similar albeit slightly down.
As the calendar flips to August, walleyes per kilometer begins to increase with between 20-30 fish observed. This increases yet again in September, upwards of 50-60 walleyes per kilometer. Further indicating an influx of fish moving into the tailrace area as the season goes on and further supporting the excellent fall fishing that takes place in this area.
Learn More: Lake Sharpe Walleye Population Remaining Steady
While these examples are both from 2026 updates, these trends remain steady year after year. This further reiterates the seasonal movements that anglers can expect to occur in these reservoirs.
The fact of the matter is that reservoir walleyes are constantly on the move, and anglers that understand their patterns and follow them throughout their movements will find the best success. This also explains the large concentrations of anglers at certain times of the year, and why these areas may not provide good fishing following this time period.
Good examples of this would be the stilling basin area on Lake Sharpe, the Chamberlain area on Lake Francis Case, and West Bend area on Lake Sharpe. Other popular “seasonal” fishing spots include the Platte area in early summer, lower end of Lake Oahe in the middle of summer, and tailrace areas of the Oahe Dam and Big Bend Dam in fall.
All of these areas are good examples of fish moving in and moving out throughout the seasons. In the spring, fish move into the stilling basin on Lake Sharpe and Chamberlain area of Lake Francis Case because of the quality spawning habitat and current. Both of these areas are on the upper end of their respective reservoirs.
In the summer months, the West Bend area on Lake Sharpe is a popular location. In fact, many anglers from the Chamberlain area will fish on the upper end of Lake Francis Case in the spring before transitioning to West Bend in the summer. This is an example of the Lake Francis Case fish moving away towards Platte, and the Lake Sharpe fish moving downriver to be closer to these anglers.
The classic “here today gone tomorrow” can certainly be a true statement on the Missouri River reservoirs, as there is an abundance of structure and elements for walleyes to use. However, the more accurate statement would probably be “here this month, there next month” as these fish navigate the reservoirs in search of their preferred elements for that specific time period.
