Boysen Reservoir fishing: Walleye, Brown Trout, Burbot
Target species: Walleye, Brown Trout, Burbot, Longnose Sucker, River Carpsucker, Sauger, Black Bullhead
Boat: 3 ramps and launches on file for this water.
Start here: Launch at Brannon, 1 lane.
The reservoir
Boysen Reservoir covers 18,585 acres in Wyoming, across Fremont County. It is a reservoir: 96.6% of it is 70 feet deep or less; the deepest point measured is at least 87.3 feet (26.6 m); at the dam, USGS RESSED gives 118 feet (36 m) at full pool. Our records hold 15 species for this water.
Depth and bottom
Deepest measured point: at least 87.3 ft (26.6 m). That is the deepest contour line: the bottom goes deeper. USGS RESSED gives 118 ft (36 m) at the dam at full pool: a measured figure, not a survey map. 96.6% of the water is 70 feet or shallower. We hold 123 depth contour lines for this water.
- 0–5 ft: 26.6% of the water
- 5–10 ft: 7.6% of the water
- 10–15 ft: 5.7% of the water
- 15–20 ft: 5.1% of the water
- 20–25 ft: 4.9% of the water
- 25–30 ft: 4.3% of the water
- 30–35 ft: 5.2% of the water
- 35–40 ft: 4.1% of the water
- 40–45 ft: 4.4% of the water
- 45–50 ft: 3.4% of the water
- 50–55 ft: 4.7% of the water
- 55–60 ft: 6.1% of the water
- 60–65 ft: 7.2% of the water
- 65–70 ft: 7.3% of the water
- 70–75 ft: 2.6% of the water
- 75–80 ft: 0.7% of the water
- 80–85 ft: 0.3% of the water
7 target fish, led by Walleye
- Walleye — Feeding water: 50–75°F.
- Brown Trout — Feeding water: 50–65°F.
- Burbot — Feeding water: 40–50°F.
- Longnose Sucker — Feeding water: 50–70°F.
- River Carpsucker — Feeding water: 65–75°F.
- Sauger — Feeding water: 45–65°F.
- Black Bullhead — Feeding water: 70–80°F.
Also recorded here: Shorthead Redhorse, White Sucker, Black Crappie, Yellow Perch, Common Carp, Emerald Shiner, Spottail Shiner, Fathead Minnow.
Water and conditions
Water clarity runs 1.8–14.3 feet on our readings, averaging 8.1 feet, from 164 readings. Our water temperature readings average 65°F; they do not cover the whole year, so this is not a yearly average. The coldest single reading we hold is 41°F and the warmest is 74°F; the warmest monthly average is 72°F. pH averages 8.3. These readings span 2020–2024.
3 ramps and launches on this water
On this water we hold 3 trailer ramps.
- Brannon — 1 lane.
- Fremont Bay — 1 lane.
- Tough Creek — 1 lane.
Fee and opening hours are blank for all 3 places in this list: a blank means we hold no such field, not that it is free or always open, and this list may not be complete.
What is hard here
Wind is the limit, not the fish: 18,585 acres of open water build a short steep chop, and there is no shelter in the middle. Clarity swings from 1.8 to 14.3 feet between our readings — the water you meet is not the water someone photographed.
Where this data comes from
- US Bureau of Reclamation — USBR reservoir sedimentation surveys: class A, a survey of the bottom, 1994.
- USGS RESSED — USGS RESSED reservoir sedimentation database: class B, a depth figure measured and published by an agency, without a bottom map.
- U.S. Bureau of Reclamation (RISE) — USBR area-capacity tables (RISE): class B, a depth figure measured and published by an agency, without a bottom map.
