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76-acre reservoir in San Juan County, Utah. The lake tops out around 46 ft. Contours on this water are modeled from its actual shoreline and max depth. Good for finding likely water, never for navigation. Every species below gets its seasonal read from the same numbers driving the chart.
The drawn water covers 78 acres wrapped in 1.6 miles of bank. A shoreline index of 1.3 says round and simple: fish relate to depth changes here, not shoreline features. Littoral water — the productive band under ~15 ft — makes up 39% of this chart, as modeled. The basin spans about 0.5 mi end to end and 0.4 mi across at its widest. It sits in San Juan County. Recapture Reservoir sits 3 mi east — the closest neighbouring chart.
Spring rainbow trout on Blanding Reservoir No. 4 hold shallow, usually 5 to 20 ft. By summer they slide out to 8 to 30 ft, and by winter most fish are in 8 to 40 ft. The chart's best answer is Break off the point — drop-off, 21 ft, prime for winter. Prime time lands in early morning and the evening. The summer box starts with a dodger + spoon (deep troll) or a flutter spoon.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Main-lake point (12 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Break off the point (21 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (12 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (21 ft) | Jigging spoon, Tube jig (white) |
Come spring, look for largemouth bass tight to the bank in 2 to 10 ft. They move out to 8 to 20 ft in summer and finish the year down in 15 to 35 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 6 ft that scores prime in spring. Best bite is early morning and the evening. A texas-rigged 10" worm or a deep-diving crankbait is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (6 ft) | Spinnerbait, Chatterbait |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (21 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (12 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 15 to 35 ft | midday | Break off the point (21 ft) | Blade bait, Jigging spoon |
Blanding Reservoir No. 4 carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 39 ft down.
| Date | Species | Count | Size |
|---|---|---|---|
| Jul 27 | Tiger Trout | 4,506 | ~3" |
| May 27 | Rainbow trout | 1,456 | ~10.1" |
| May 18 | Rainbow trout | 1,820 | ~10.1" |
| Apr 7 | Rainbow trout | 1,680 | ~10.9" |
| Oct 15, 2025 | Rainbow trout | 1,540 | ~10.2" |
| Aug 27, 2025 | Rainbow trout | 2,009 | ~9.3" |
| Jul 17, 2025 | Tiger Trout | 4,524 | ~3" |
Source: Utah DWR fish-stocking report, retrieved 2026-08-18.
Season dates, license requirements, and size and bag limits for Utah waters are set by the Utah Division of Wildlife Resources — and special regulations can apply to Blanding Reservoir No. 4 specifically, so confirm the current rules before you fish.
Check the official Utah fishing regulations →
Blanding Reservoir No. 4 is about 46 ft (14 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
Anglers target rainbow trout, largemouth bass on Blanding Reservoir No. 4.
Shallow bay flat is the top-rated area: a weed flat in about 6 ft of water that rates prime for largemouth bass in spring. Scroll up to the map for the complete spot list by species and season.
For rainbow trout, 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.
Yes — per Utah DWR fish-stocking report records, Blanding Reservoir No. 4 was most recently stocked Jul 27 with 4,506 tiger trout. The full stocking history is listed above.
Fishing on Blanding Reservoir No. 4 is regulated by the Utah Division of Wildlife Resources. Check the official Utah regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Recapture Reservoir 3 mi · Lloyds Lake 15 mi · Monticello Lake 16 mi · McPhee Reservoir 54 mi, CO · Kens Lake 56 mi · Puett Reservoir 62 mi, CO · Groundhog Reservoir 66 mi, CO · Lake Powell 77 mi, UT/AZ · Trout Lake 89 mi, CO · Andrews Lake 98 mi, CO · Lower Bowns Reservoir 101 mi · Lemon Reservoir 102 mi, CO
See how Blanding Reservoir No. 4 stacks up: best largemouth bass lakes in Utah · best rainbow trout lakes in Utah
More water nearby: San Juan County fishing maps (5 charts). Browse all Utah fishing maps or see every water on DepthScout. 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.