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3,523-acre lake near Bethel Island. The lake tops out around 35 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. Every species below gets its seasonal read from the same numbers driving the chart.
On the chart, Franks Tract draws 4,280 acres inside 11.5 miles of shoreline. Its 1.3 shoreline index means few bank features; the contours below do the pattern work. Roughly 98% of the water is 15 ft or less, the band where the food chain lives. Call it 3.6 mi long by 3.2 mi wide at the broadest reach. The water lies in Contra Costa County. For a second option, Big Break lies 6 mi west.
In spring, largemouth bass run shallow here, mostly 2 to 10 ft. Summer pushes them deeper, 8 to 20 ft, and winter fish settle into 15 to 35 ft. Shallow bay flat is the standout, a weed flat at roughly 2 ft, rated prime for spring largemouth bass. Time it for early morning and the evening. You won't need more than a texas-rigged 10" worm or a deep-diving crankbait most summer days.
| 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 | Break off the point (8 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (9 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 15 to 35 ft | midday | Deep basin (26 ft) | Blade bait, Jigging spoon |
Spring striped bass on Franks Tract hold shallow, usually 5 to 20 ft. By summer they slide out to 11 to 35 ft, and by winter most fish are in 11 to 35 ft. The chart's best answer is Deep basin — deep basin, 26 ft, prime for summer. Prime time lands in early morning and the evening. The summer box starts with a flutter spoon (deep) or an umbrella rig (trolled).
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Main-lake point (9 ft) | Bucktail jig + trailer, Walking topwater (dawn) |
| Summer | 11 to 35 ft | dawn & dusk | Deep basin (26 ft) | Flutter spoon (deep), Umbrella rig (trolled) |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (9 ft) | Topwater walker, Jerkbait |
| Winter | 11 to 35 ft | midday | Deep basin (26 ft) | Alabama rig (slow), Flutter spoon |
The spring pattern is a shallow one: bluegill in 1 to 6 ft. As the season builds they drop to 4 to 15 ft, wintering in 10 to 25 ft. Top water on the chart: Shallow bay flat, a weed flat in the 2 ft range, prime in spring. Time it for early morning and the evening. Summer baits: a small sponge spider (fly) or a micro tube jig gets it done.
| 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 (4 ft) | Small sponge spider (fly), Micro tube jig |
| Fall | 6 to 18 ft | midday | Break off the point (8 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 10 to 25 ft | midday | Deep basin (26 ft) | Tiny spoon |
Spring puts crappie in skinny water — 2 to 8 ft is the zone. As the season builds they drop to 10 to 25 ft, wintering in 15 to 35 ft. Fall crappie concentrate at Old creek channel, a prime-rated creek channel around 8 ft. Warm-month bites cluster around early morning and the evening. A jig trolled/spider-rigged or a small crankbait (trolled) covers the summer program.
| 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 | Old creek channel (8 ft) | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 8 to 20 ft | dawn | Old creek channel (8 ft) | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 15 to 35 ft | midday | Deep basin (26 ft) | Tungsten jig + soft plastic, Tiny jigging spoon |
In spring, channel catfish run shallow here, mostly 3 to 12 ft. Summer pushes them deeper, 8 to 25 ft, and winter fish settle into 11 to 35 ft. Old creek channel is the standout, a creek channel at roughly 8 ft, rated prime for summer channel catfish. Time it for after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dusk | Creek inflow (2 ft) | |
| Summer | 8 to 25 ft | night & dusk | Old creek channel (8 ft) | |
| Fall | 10 to 30 ft | dusk | Deep basin (26 ft) | |
| Winter | 11 to 35 ft | midday | Deep basin (26 ft) |
Franks Tract carries 13 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 26 ft down.
Access data: OpenStreetMap contributors (ODbL) — community-mapped launches. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for California waters are set by the California Department of Fish and Wildlife — and special regulations can apply to Franks Tract specifically, so confirm the current rules before you fish.
Check the official California fishing regulations →
Franks Tract is about 35 ft (11 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
Anglers target largemouth bass, striped bass, bluegill, crappie, channel catfish on Franks Tract.
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. The interactive chart above rates every 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 Franks Tract is regulated by the California Department of Fish and Wildlife. Check the official California regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Big Break 6 mi · Clifton Court Forebay 14 mi · Bethany Reservoir 18 mi · Suisun Bay 21 mi · Lake Del Valle 31 mi · Napa River 40 mi · American River (Lower) 41 mi · San Pablo Bay 42 mi · Richardson Bay 49 mi · Petaluma River 51 mi · Lake Berryessa 52 mi · Folsom Lake 58 mi
See how Franks Tract stacks up: best largemouth bass lakes in California · best crappie lakes in California · best bluegill lakes in California · best channel catfish lakes in California
Browse all California fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. 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.