Lake Mary Ronan fishing: Largemouth Bass, Rainbow Trout, Cutthroat Trout

Target species: Largemouth Bass, Rainbow Trout, Cutthroat Trout, Brook Trout, Yellow Perch, Arctic Grayling, Northern Pike

The lake

Lake Mary Ronan covers 1,517 acres in Montana, across Lake County. It is a lake: the deepest point measured is at least 40 feet (12.2 m). Our records hold 8 species for this water.

Lake Mary Ronan.jpg
Derek Swanson from Minneapolis MN, U.S.A · CC BY 2.0

7 target fish, led by Largemouth Bass

  • Largemouth Bass — Feeding water: 65–85°F.
  • Rainbow Trout — Feeding water: 50–65°F.
  • Cutthroat Trout — Feeding water: 50–65°F.
  • Brook Trout — Feeding water: 50–65°F.
  • Yellow Perch — Feeding water: 45–75°F.
  • Arctic Grayling — Feeding water: 50–65°F.
  • Northern Pike — Feeding water: 50–75°F.

Also recorded here: Pumpkinseed.

Stocking: 42,805,504 fish, 1997–2026

Montana Fish, Wildlife & Parks records list 42,805,504 fish released into this water from 1997 to 2026.

  • Rainbow Trout: 7,846,114 in 1987–2026
  • Arctic Grayling: 1,220,000 in 1933–1954
  • Brook Trout: 581,460 in 1933–1950
  • Largemouth Bass: 256,888 in 1991–2024
  • Cutthroat Trout: 25,000 in 1952

5 more species on the stocking list.

Depth and bottom

Deepest measured point: at least 40 ft (12.2 m). That is the deepest contour line: the bottom goes deeper. We hold 57 depth contour lines for this water.

  • 0–2 ft: 4.2% of the water
  • 2–4 ft: 4.1% of the water
  • 4–6 ft: 3.5% of the water
  • 6–8 ft: 3.2% of the water
  • 8–10 ft: 3% of the water
  • 10–12 ft: 2.8% of the water
  • 12–14 ft: 2.6% of the water
  • 14–16 ft: 2.5% of the water
  • 16–18 ft: 2.4% of the water
  • 18–20 ft: 2.4% of the water
  • 20–22 ft: 2.3% of the water
  • 22–24 ft: 2.4% of the water
  • 24–26 ft: 2.4% of the water
  • 26–28 ft: 2.5% of the water
  • 28–30 ft: 2.8% of the water
  • 30–32 ft: 3.4% of the water
  • 32–34 ft: 3.6% of the water
  • 34–36 ft: 5.3% of the water
  • 36–38 ft: 6.5% of the water
  • 38–40 ft: 38.2% of the water

Water and conditions

Water clarity runs 8.3–20.5 feet on our readings, averaging 15.1 feet, from 47 readings. Our water temperature readings average 72°F; they do not cover the whole year, so this is not a yearly average. These readings span 2017–2023.

Where this data comes from

  • Montana Fish, Wildlife & Parks — Montana Fish, Wildlife & Parks: depth contours: class A, a survey of the bottom.
  • EPA NLA — EPA National Lakes Assessment: class B, a depth figure measured and published by an agency, without a bottom map.
  • Webster, K.E., McCullough, I.M., Soranno, P.A. LAGOS-US DEPTH v1.0, EDI, doi:10.6073/pasta/64ddc4d04661d9aef4bd702dc5d8984f (CC BY 4.0); Cheruvelil et al. LAGOS-US LOCUS v1.0 (EDI) — LAGOS-US DEPTH v1.0: Lake depth for 17,675 lakes in the conterminous U.S.: class B, a depth figure measured and published by an agency, without a bottom map.