Arrowrock Reservoir fishing: Rainbow Trout, Cutthroat Trout, Smallmouth Bass
Target species: Rainbow Trout, Cutthroat Trout, Smallmouth Bass, Yellow Perch
Boat: 1 ramp or launch on file for this water.
Start here: Launch at Cinch Creek.
The reservoir
Arrowrock Reservoir covers 2,835 acres in Idaho, across 2 counties: Elmore and Boise. It is a reservoir: 90.3% of it is 90 feet deep or less; the deepest point measured is ≈166 feet (50.7 m). Our records hold 4 species for this water.
Depth and bottom
Deepest measured point: ≈166 ft (50.7 m). 90.3% of the water is 90 feet or shallower. We hold 123 depth contours for this water, drawn from 17,614 soundings.
- 0–10 ft: 31.1% of the water
- 10–20 ft: 11.4% of the water
- 20–30 ft: 9.5% of the water
- 30–40 ft: 7.4% of the water
- 40–50 ft: 6% of the water
- 50–60 ft: 7.2% of the water
- 60–70 ft: 6.9% of the water
- 70–80 ft: 5.5% of the water
- 80–90 ft: 5.3% of the water
- 90–100 ft: 3.6% of the water
- 100–110 ft: 2.6% of the water
- 110–120 ft: 1.5% of the water
- 120–130 ft: 1.3% of the water
- 130–140 ft: 0.6% of the water
- 140–150 ft: 0.1% of the water
Stocking: 9,209,670 fish, 1996–2026
Idaho Department of Fish and Game records list 9,209,670 fish released into this water from 1996 to 2026.
- Rainbow Trout: 5,793,247 in 2007–2026
5 more species on the stocking list.
4 target fish, led by Rainbow Trout
- Rainbow Trout — Feeding water: 50–65°F.
- Cutthroat Trout — Feeding water: 50–65°F.
- Smallmouth Bass — Feeding water: 60–75°F.
- Yellow Perch — Feeding water: 45–75°F.
1 ramp or launch on this water
On this water we hold 1 boat ramp.
- Cinch Creek — US Forest Service. website fs.usda.gov/recarea/asnf/recreation/recarea/?recid=81119 · hours: May 15 - October 1st Unless closed by snow
The place listed has no fee or opening hours on file: a blank means we hold no such field, not that it is free or always open, and this list may not be complete.
Water and conditions
Our water temperature readings average 56°F; they do not cover the whole year, so this is not a yearly average. pH averages 7.3. These readings span 2017–2020. The latest reading is from 2020, more than three years ago: read these numbers as history, not as the water today.
What is hard here
Only 1 public ramp is on file, so the launch decides where you fish.
Where this data comes from
- US Bureau of Reclamation — USBR reservoir sedimentation surveys: class A, a survey of the bottom, 1997.
- EPA NLA — EPA National Lakes Assessment: class B, a depth figure measured and published by an agency, without a bottom map, 2007.
- 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.
Part of these depths rest on an averaged water level, so they are approximate (≈).
