Grasmere Reservoir

Snake River Drainage

  • Recommended Fishing Water

Grasmere Reservoir in Owyhee County is 224.5 acres.

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Grasmere Reservoir is a remote irrigation reservoir with slightly turbid water throughout most of the year. Lahontan cutthroat are the primary game fish. Crayfish are abundant also.

Facilities

Motor Restriction
No
Boat Ramp
No
Dock
No
Toilet
Yes
Campground
No
ADA Access
Yes

Recommended Game Fish

Species Observed in Surveys

Fish Stocking Records

Date Species Quantity General Size
2023/10/06 Lahontan Cutthroat 20,040 Fingerling (3-6 inches)
2022/09/26 Lahontan Cutthroat 20,036 Fingerling (3-6 inches)
2021/09/28 Lahontan Cutthroat 26,112 Fingerling (3-6 inches)
2020/09/29 Lahontan Cutthroat 28,240 Fingerling (3-6 inches)
2019/09/11 Lahontan Cutthroat 30,984 Fry (0-3 inches)
2018/09/25 Lahontan Cutthroat 25,734 Fingerling (3-6 inches)
2017/09/21 Lahontan Cutthroat 23,276 Fingerling (3-6 inches)
2016/09/29 Rainbow - Hayspur Triploid 1,036 Catchable (6+ inches)
2013/09/23 Lahontan Cutthroat 29,827 Fingerling (3-6 inches)
2012/09/19 Lahontan Cutthroat 33,880 Fingerling (3-6 inches)
2010/09/22 Lahontan Cutthroat 24,898 Fingerling (3-6 inches)
2009/09/08 Lahontan Cutthroat 20,280 Fry (0-3 inches)
2008/06/25 Lahontan Cutthroat 49,236 Fry (0-3 inches)
2007/06/28 Lahontan Cutthroat 49,918 Fry (0-3 inches)
2006/06/13 Lahontan Cutthroat 20,868 Fry (0-3 inches)
2005/06/16 Lahontan Cutthroat 20,944 Fry (0-3 inches)
2004/06/16 Lahontan Cutthroat 28,000 Fry (0-3 inches)
2003/06/24 Lahontan Cutthroat 24,840 Fry (0-3 inches)
2002/06/25 Lahontan Cutthroat 24,600 Fry (0-3 inches)
2001/06/21 Lahontan Cutthroat 24,641 Fry (0-3 inches)
2000/06/13 Lahontan Cutthroat 25,185 Fry (0-3 inches)
1998/06/24 Lahontan Cutthroat 24,900 Fry (0-3 inches)
1997/06/19 Lahontan Cutthroat 15,460 Fry (0-3 inches)
1996/06/18 Lahontan Cutthroat 7,490 Fry (0-3 inches)
1995/06/27 Lahontan Cutthroat 7,475 Fry (0-3 inches)
1994/06/08 Lahontan Cutthroat 6,000 Fry (0-3 inches)
1993/06/29 Lahontan Cutthroat 13,075 Fry (0-3 inches)
1992/10/27 Lahontan Cutthroat 2,700 Fingerling (3-6 inches)
1991/11/19 Lahontan Cutthroat 3,120 Fingerling (3-6 inches)
1988/09/10 Lahontan Cutthroat 10,250 Fingerling (3-6 inches)
1986/04/17 Rainbow Unspecified 6,080 Catchable (6+ inches)
1985/05/21 Rainbow Unspecified 6,080 Catchable (6+ inches)
1983/05/26 Mt Whitney Rainbow 6,120 Catchable (6+ inches)
1982/05/28 Rainbow Unspecified 8,510 Catchable (6+ inches)
1981/03/25 Rainbow Unspecified 2,700 Catchable (6+ inches)
1980/04/30 Rainbow Unspecified 7,440 Catchable (6+ inches)
1979/06/29 Rainbow Unspecified 1,410 Catchable (6+ inches)
1979/05/03 Rainbow Unspecified 5,760 Catchable (6+ inches)
1978/05/19 Rainbow Unspecified 7,200 Catchable (6+ inches)
1976/06/01 Rainbow Unspecified 6,300 Catchable (6+ inches)
1976/05/21 Rainbow Unspecified 5,040 Catchable (6+ inches)
1975/06/25 Rainbow Unspecified 3,960 Catchable (6+ inches)
1975/05/28 Rainbow Unspecified 5,520 Catchable (6+ inches)
1974/05/22 Rainbow Unspecified 6,510 Catchable (6+ inches)
1973/04/06 Rainbow Unspecified 6,090 Catchable (6+ inches)
1973/03/19 Rainbow Unspecified 4,320 Catchable (6+ inches)
1972/03/16 Rainbow Unspecified 3,360 Adults
1972/03/15 Rainbow Unspecified 3,360 Adults
1971/05/12 Rainbow Unspecified 7,920 Catchable (6+ inches)
1971/04/29 Rainbow Unspecified 7,200 Catchable (6+ inches)
1971/04/14 Rainbow Unspecified 3,600 Catchable (6+ inches)
1970/07/08 Rainbow Unspecified 14,310 Fry (0-3 inches)
1970/06/11 Rainbow Unspecified 14,700 Catchable (6+ inches)
1969/05/16 Rainbow Unspecified 23,340 Fry (0-3 inches)
1969/05/14 Rainbow Unspecified 5,250 Catchable (6+ inches)
1969/05/05 Rainbow Unspecified 5,460 Catchable (6+ inches)
1968/05/24 Rainbow Unspecified 4,080 Catchable (6+ inches)
Source: IDFG Fish Stocking Database.

Licenses and Tags

Learn more about IDFG Licenses, Tags & Permits
 

Be aware of Fish Consumption Advisories associated with this waterbody. More information can be found here.

Fishing Rules, 2022 - 2024

All Waters Open All Year

Except as modified in Special Rules
Fishing is not allowed within the posted upstream and downstream boundary of any fish weir or trap.

Daily Bag Limits

The following daily bag limits apply to all waters within each region except as modified in the Special Rules. The possession limit is 3-times the daily bag limit after the second day of the season.

Special Rules

No Special Rules for Grasmere Reservoir.
Southwest Region Bag Limits
Bass (Largemouth and Smallmouth)

  • Bass limit is 6, both species combined
  • None under 12 inches

Brook Trout

  • Brook Trout limit is 25
  • Harvest allowed during any open season unless otherwise noted under Special Rules - if gear or bait restrictions are listed, they must be followed when fishing for Brook Trout

Bull Trout

  • Bull Trout limit is 0, catch-and-release

Kokanee

  • Kokanee limit is 6

Salmon

  • Spring and summer Chinook Salmon seasons and limits are set by the Idaho Fish and Game Commission and issued in separate brochures
  • Seasons and limits for fall Chinook Salmon and Coho Salmon can be found here
  • Sockeye Salmon limit is 0 and fishing for or targeting Sockeye Salmon is illegal
  • Fishing for or targeting salmon is prohibited unless a salmon season is specifically opened for that water 

Steelhead (ocean-going)

  • Defined as Rainbow Trout longer than twenty (20) inches in length in the Salmon River drainage (excluding lakes and reservoirs). Between Hells Canyon Dam and Oxbow Dam and the Boise River from its mouth upstream to Barber Dam during steelhead seasons, steelhead are Rainbow Trout over twenty (20) inches in length with the adipose fin clipped (as evidenced by a healed scar)
  • Fishing for or targeting steelhead is prohibited unless a steelhead season is specifically opened for that water. See fishing regulations for details

Sturgeon

  • Sturgeon limit is 0, catch-and-release
  • Sturgeon must not be removed from the water and must be released upon landing
  • Barbless hooks are required
  • Use of a sliding swivel device to secure a weight, and a lighter test line to secure weight to sliding swivel device is required. See fishing regulations for details

Tiger Muskie

  • Tiger Muskie limit is 2, none under 40 inches

Trout includes Brown Trout, Lake Trout, Golden Trout, Arctic Grayling, Cutthroat Trout, Rainbow Trout, land-locked Chinook and Coho Salmon, trout hybrids (e.g. Tiger Trout)

  • Trout limit is 6, all species combined
  • Does not include Bull Trout and Brook Trout which are listed separately

Whitefish

  • Whitefish limit is 25
  • Harvest allowed during any open season unless otherwise noted under Special Rules - if gear or bait restrictions are listed, they must be followed when fishing for whitefish

Protected Nongame Fish includes Pacific Lamprey

  • May not be harvested or possessed

All Other Fish Species includes bullfrogs and crayfish

  • No bag, size or possession limit
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