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Rating depth structure for largemouth bass.
Recent public catches load as you reach this section.
43-acre lake near Thayer. Public southeast Kansas city lake with KBS surveyed bathymetric contours. The lake tops out around 25 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. Here's the year, species by species, as the scoring engine sees it.
Shoreline on the chart totals 1.8 miles. The 2.5 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. About 74% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. Figure 0.5 mi of water from one end to the other, 0.3 mi at the beam. It sits in Neosho County. Its nearest charted neighbour, Thayer New City Lake, is 1 mi to the west.
Early season largemouth bass use the shallows, holding in 2 to 10 ft. Summer is an 8 to 20 ft game here, winter an 8 to 25 ft one. The chart's best answer is Shallow bay flat — weed flat, 2 ft, prime for spring. Best bite is early morning and the evening. Tie on a texas-rigged 10" worm or a deep-diving crankbait and you're in the game.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (2 ft) | Spinnerbait, Chatterbait |
| Summer | 8 to 20 ft | dawn & dusk | Back-bay flat (8 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (4 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 8 to 25 ft chart-limited; documented 15 to 35 ft | midday | Deep basin (22 ft) | Blade bait, Jigging spoon |
Early season channel catfish use the shallows, holding in 3 to 12 ft. Summer is an 8 to 25 ft game here, winter an 8 to 25 ft one. The chart's best answer is Deep basin — deep basin, 22 ft, prime for winter. Best bite is after dark and the evening.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dusk | Back-bay flat (8 ft) | |
| Summer | 8 to 25 ft | night & dusk | Deep basin (22 ft) | |
| Fall | 8 to 25 ft chart-limited; documented 10 to 30 ft | dusk | Deep basin (22 ft) | |
| Winter | 8 to 25 ft chart-limited; documented 20 to 40 ft | midday | Deep basin (22 ft) |
Spring crappie on Thayer Old City Lake hold shallow, usually 2 to 8 ft. They move out to 10 to 25 ft in summer and finish the year down in 8 to 25 ft. Put Deep basin first on the milk run — a deep basin near 22 ft that grades prime for winter. The feeding windows run early morning and the evening. The summer box starts with a jig trolled/spider-rigged or a small crankbait (trolled).
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (2 ft) | 1/16 oz jig + tube, Curly-tail grub |
| Summer | 10 to 25 ft | dawn & dusk | Deep basin (22 ft) | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 8 to 20 ft | dawn | Back-bay flat (8 ft) | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 8 to 25 ft chart-limited; documented 15 to 35 ft | midday | Deep basin (22 ft) | Tungsten jig + soft plastic, Tiny jigging spoon |
Spring bluegill on Thayer Old City Lake hold shallow, usually 1 to 6 ft. By summer they slide out to 4 to 15 ft, and by winter most fish are in 10 to 25 ft. The chart's best answer is Shallow bay flat — weed flat, 2 ft, prime for spring. Prime time lands in early morning and the evening. The summer box starts with a small sponge spider (fly) or a micro tube jig.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | Shallow bay flat (2 ft) | 1/32 oz jig + micro plastic, Tiny popper (evenings) |
| Summer | 4 to 15 ft | dawn & dusk | Back-bay flat (8 ft) | Small sponge spider (fly), Micro tube jig |
| Fall | 6 to 18 ft | midday | Back-bay flat (8 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 10 to 25 ft | midday | Deep basin (22 ft) | Tiny spoon |
Structure-wise the chart holds 5 features, led in depth by Deep basin at roughly 22 ft.
Season dates, license requirements, and size and bag limits for Kansas waters are set by the Kansas Department of Wildlife & Parks — and special regulations can apply to Thayer Old City Lake specifically, so confirm the current rules before you fish.
Check the official Kansas fishing regulations →
Thayer Old City Lake is about 25 ft (8 m) deep at its deepest point. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Anglers target largemouth bass, channel catfish, crappie, bluegill on Thayer Old City Lake.
Shallow bay flat is the top-rated area: a weed flat in about 2 ft of water that rates prime for largemouth bass in spring. Open the map above to see every rated spot for each species and season.
For largemouth bass, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Thayer Old City Lake is regulated by the Kansas Department of Wildlife & Parks. Check the official Kansas regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Thayer New City Lake 1 mi · Parsons Lake 9 mi · Big Hill Lake 13 mi · Verdigris River 17 mi · Wilson County State Fishing Lake 18 mi · Elk City Lake 24 mi · Woodson County State Fishing Lake 29 mi · New Yates Center Lake 30 mi · Yates Center Reservoir 30 mi · Toronto Lake 32 mi · Fall River Lake 35 mi · Severy City Lake 39 mi
See how Thayer Old City Lake stacks up: best largemouth bass lakes in Kansas · best crappie lakes in Kansas · best bluegill lakes in Kansas · best channel catfish lakes in Kansas
Browse all Kansas fishing maps. See every water on DepthScout. Bathymetry: published agency survey data. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.