Mosquito Flat Reservoir

Flows into the Challis Creek

  • Recommended Fishing Water

Mosquito Flat Reservoir in Custer County is 49.4 acres.

Bureau of Land Management, Esri Canada, Esri, HERE, Garmin, INCREMENT P, USGS, METI/NASA, EPA, USDA |
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Facilities

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

Recommended Game Fish

Species Observed in Surveys

Fish Stocking Records

Date
Species
Quantity
General Size
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Date
Species
Quantity
General Size
2024/08/01 Rainbow Trout - Triploid 1,343 Catchable (12-14 inches)
2024/07/18 Rainbow Trout - Triploid 700 Catchable (12-14 inches)
2024/06/10 Rainbow Trout - Triploid 1,015 Catchable (12-14 inches)
2023/09/27 Rainbow Trout - Triploid 1,210 Catchable (12-14 inches)
2023/09/06 Rainbow Trout - Triploid 1,207 Catchable (12-14 inches)
2023/07/28 Rainbow Trout - Triploid 1,051 Catchable (12-14 inches)
2023/07/03 Kokanee - Triploid 9,241 Fry (0-3 inches)
2023/06/29 Rainbow Trout - Triploid 1,068 Catchable (12-14 inches)
2022/07/11 Rainbow Trout - Triploid 1,015 Catchable (12-14 inches)
2022/06/08 Rainbow Trout - Triploid 1,006 Catchable (12-14 inches)
2022/06/02 Kokanee 7,212 Fry (0-3 inches)
2022/05/19 Rainbow Trout - Triploid 1,008 Catchable (12-14 inches)
2021/08/23 Rainbow Trout - Triploid 2,236 Catchable (6+ inches)
2021/08/06 Chinook Salmon 184 Sub-Catchable (6-8 inches)
2021/07/23 Chinook Salmon 67 Sub-Catchable (6-8 inches)
2021/07/08 Chinook Salmon 250 Sub-Catchable (6-8 inches)
2021/07/08 Rainbow Trout - Triploid 2,114 Catchable (12-14 inches)
2021/06/14 Kokanee - Triploid 16,603 Fry (0-3 inches)
2021/06/11 Rainbow Trout - Triploid 2,122 Catchable (12-14 inches)
2020/09/25 Rainbow Trout - Triploid 1,500 Catchable (6+ inches)
2020/07/10 Rainbow Trout - Triploid 1,000 Catchable (6+ inches)
2020/06/19 Kokanee 9,081 Fry (0-3 inches)
2020/05/26 Rainbow Trout - Triploid 2,002 Catchable (12-14 inches)
2019/10/24 Rainbow Trout - Triploid 286 Catchable (12-14 inches)
2019/10/24 Rainbow Trout - Triploid 833 Catchable (6+ inches)
2019/10/02 Rainbow Trout - Triploid 1,008 Catchable (12-14 inches)
2019/06/11 Rainbow Trout - Triploid 1,499 Catchable (12-14 inches)
2019/05/31 Rainbow Trout - Triploid 1,549 Catchable (12-14 inches)
2018/08/24 Rainbow Trout - Triploid 496 Catchable (12-14 inches)
2018/08/24 Rainbow Trout - Triploid 1,500 Catchable (6+ inches)
2018/07/13 Rainbow Trout - Triploid 901 Catchable (12-14 inches)
2018/06/13 Rainbow Trout - Triploid 1,800 Catchable (12-14 inches)
2018/06/05 Kokanee 6,020 Fry (0-3 inches)
2017/07/10 Rainbow Trout - Triploid 1,221 Catchable (6+ inches)
2017/06/21 Rainbow Trout - Triploid 1,238 Catchable (6+ inches)
2017/05/25 Rainbow Trout - Triploid 900 Catchable (6+ inches)
2016/08/22 Rainbow Trout - Triploid 604 Catchable (6+ inches)
2016/07/21 Rainbow Trout - Triploid 1,812 Catchable (6+ inches)
2016/06/24 Rainbow Trout - Triploid 901 Catchable (6+ inches)
2016/06/09 Kokanee 7,054 Fingerling (3-6 inches)
2015/08/13 Rainbow Trout - Triploid 998 Catchable (6+ inches)
2015/07/16 Rainbow Trout - Triploid 1,501 Catchable (6+ inches)
2015/06/25 Rainbow Trout - Triploid 1,502 Catchable (6+ inches)
2015/05/29 Rainbow Trout - Triploid 1,652 Catchable (6+ inches)
2014/08/21 Rainbow Trout - Triploid 999 Catchable (6+ inches)
2014/07/24 Rainbow Trout - Triploid 1,562 Catchable (6+ inches)
2014/06/27 Rainbow Trout - Triploid 1,661 Catchable (6+ inches)
2014/05/16 Rainbow Trout - Triploid 1,500 Catchable (6+ inches)
2013/10/19 Rainbow Trout - Triploid 1,000 Catchable (6+ inches)
2013/06/26 Rainbow Trout - Triploid 1,500 Catchable (6+ inches)
2013/05/23 Rainbow Trout - Triploid 1,513 Catchable (6+ inches)
2012/07/28 Rainbow Trout - Triploid 1,500 Catchable (6+ inches)
2012/06/21 Rainbow Trout - Triploid 1,524 Catchable (6+ inches)
2012/05/24 Rainbow Trout - Triploid 1,507 Catchable (6+ inches)
2011/10/13 Cutthroat Trout - Westslope 19,654 Fry (0-3 inches)
2011/10/13 Rainbow Trout - Triploid 1,001 Catchable (6+ inches)
2011/07/14 Rainbow Trout - Triploid 1,500 Catchable (6+ inches)
2011/06/17 Rainbow Trout - Triploid 1,627 Catchable (6+ inches)
2011/05/26 Rainbow Trout - Triploid 1,501 Catchable (6+ inches)
2010/10/08 Rainbow Trout - Triploid 2,099 Catchable (6+ inches)
2010/07/01 Rainbow Trout - Triploid 1,506 Catchable (6+ inches)
2010/06/10 Rainbow Trout - Triploid 1,519 Catchable (6+ inches)
2010/05/25 Rainbow Trout - Triploid 1,506 Catchable (6+ inches)
2009/09/17 Rainbow Trout - Triploid 1,040 Catchable (6+ inches)
2009/07/14 Rainbow Trout - Triploid 1,540 Catchable (6+ inches)
2009/06/24 Rainbow Trout - Triploid 3,036 Catchable (6+ inches)
2008/06/23 Rainbow Trout - Triploid 3,640 Catchable (6+ inches)
2008/05/20 Rainbow Trout - Triploid 1,501 Catchable (6+ inches)
2007/07/06 Rainbow Trout - Triploid 1,500 Catchable (6+ inches)
2007/06/21 Rainbow Trout - Triploid 1,496 Catchable (6+ inches)
2007/06/01 Rainbow Trout - Triploid 1,615 Catchable (6+ inches)
2006/10/13 Rainbow Trout - Triploid 900 Catchable (6+ inches)
2006/07/14 Rainbow Trout - Triploid 1,530 Catchable (6+ inches)
2006/06/20 Rainbow Trout - Triploid 1,520 Catchable (6+ inches)
2006/05/24 Rainbow Trout - Triploid 1,523 Catchable (6+ inches)
2005/07/14 Rainbow Trout - Triploid 1,530 Catchable (6+ inches)
2005/06/13 Rainbow Trout - Triploid 1,500 Catchable (6+ inches)
2005/05/31 Rainbow Trout - Triploid 1,530 Catchable (6+ inches)
2004/07/20 Rainbow Trout - Triploid 1,553 Catchable (6+ inches)
2004/06/29 Rainbow Trout - Triploid 1,575 Catchable (6+ inches)
2004/06/17 Rainbow Trout - Triploid 1,450 Catchable (6+ inches)
2003/10/24 Rainbow Trout - Triploid 1,020 Catchable (6+ inches)
2003/07/15 Rainbow Trout - Triploid 1,560 Catchable (6+ inches)
2003/06/23 Rainbow Trout - Triploid 1,520 Catchable (6+ inches)
2003/05/27 Rainbow Trout - Triploid 1,503 Catchable (6+ inches)
2002/10/17 Rainbow Trout 2,080 Catchable (6+ inches)
2002/09/27 Rainbow Trout 1,008 Catchable (6+ inches)
2002/07/16 Rainbow Trout 1,500 Catchable (6+ inches)
2002/06/18 Rainbow Trout 1,500 Catchable (6+ inches)
2002/05/30 Rainbow Trout 1,575 Catchable (6+ inches)
2001/10/02 Rainbow Trout 1,680 Catchable (6+ inches)
2001/07/03 Rainbow Trout 1,499 Catchable (6+ inches)
2001/06/07 Rainbow Trout 1,559 Catchable (6+ inches)
2001/05/14 Rainbow Trout 1,520 Catchable (6+ inches)
2000/07/17 Rainbow Trout 1,200 Catchable (6+ inches)
2000/06/12 Rainbow Trout 1,500 Catchable (6+ inches)
2000/06/05 Steelhead 400 Catchable (6+ inches)
2000/05/23 Rainbow Trout 1,500 Catchable (6+ inches)
1999/08/23 Rainbow Trout 5,500 Fry (0-3 inches)
1999/07/12 Rainbow Trout 598 Catchable (6+ inches)
1999/06/30 Rainbow Trout 11,948 Fingerling (3-6 inches)
1999/06/16 Rainbow Trout 935 Catchable (6+ inches)
1999/06/08 Steelhead 1,570 Catchable (6+ inches)
1999/06/08 Steelhead 4,500 Fingerling (3-6 inches)
1999/05/27 Rainbow Trout 1,275 Catchable (6+ inches)
1998/09/01 Rainbow Trout 2,725 Fingerling (3-6 inches)
1998/08/27 Rainbow Trout 1,396 Catchable (6+ inches)
1998/08/12 Rainbow Trout 5,069 Fingerling (3-6 inches)
1998/07/06 Rainbow Trout 1,500 Catchable (6+ inches)
1998/05/28 Rainbow Trout 3,033 Catchable (6+ inches)
1998/05/19 Steelhead 3,000 Catchable (6+ inches)
1997/10/03 Rainbow Trout 2,700 Catchable (6+ inches)
1997/07/14 Rainbow Trout 1,740 Catchable (6+ inches)
1997/06/27 Rainbow Trout 10,175 Fingerling (3-6 inches)
1997/06/17 Rainbow Trout 1,500 Catchable (6+ inches)
1997/05/23 Rainbow Trout 1,551 Catchable (6+ inches)
1996/10/03 Rainbow Trout 1,000 Catchable (6+ inches)
1996/07/16 Rainbow Trout 1,500 Catchable (6+ inches)
1996/06/19 Rainbow Trout 10,008 Fingerling (3-6 inches)
1996/06/18 Rainbow Trout 1,500 Catchable (6+ inches)
1996/06/10 Rainbow Trout 1,550 Catchable (6+ inches)
1995/09/21 Rainbow Trout 2,000 Catchable (6+ inches)
1995/09/19 Rainbow Trout 950 Adults
1995/07/18 Rainbow Trout 1,560 Catchable (6+ inches)
1995/06/21 Rainbow Trout 900 Adults
1995/06/14 Rainbow Trout 10,000 Fingerling (3-6 inches)
1995/06/12 Rainbow Trout 1,582 Catchable (6+ inches)
1995/05/24 Rainbow Trout 1,561 Catchable (6+ inches)
1994/10/11 Rainbow Trout 16,832 Catchable (6+ inches)
1994/09/14 Rainbow Trout 1,000 Catchable (6+ inches)
1994/06/06 Rainbow Trout 2,062 Catchable (6+ inches)
1994/05/27 Rainbow Trout 1,000 Catchable (6+ inches)
1994/05/19 Rainbow Trout 7,500 Fingerling (3-6 inches)
1993/08/05 Bull Trout 416 Catchable (6+ inches)
1993/05/24 Rainbow Trout 2,000 Catchable (6+ inches)
1992/05/26 Rainbow Trout 2,200 Catchable (6+ inches)
1991/06/13 Rainbow Trout 2,100 Catchable (6+ inches)
1990/06/09 Rainbow Trout 1,000 Catchable (6+ inches)
1990/05/16 Rainbow Trout 1,000 Catchable (6+ inches)
1989/06/08 Rainbow Trout 1,980 Catchable (6+ inches)
1989/05/23 Rainbow Trout 2,100 Catchable (6+ inches)
1988/05/25 Rainbow Trout 1,980 Catchable (6+ inches)
1987/05/15 Rainbow Trout 2,160 Catchable (6+ inches)
1986/05/19 Rainbow Trout 2,023 Catchable (6+ inches)
1985/05/17 Rainbow Trout 2,010 Catchable (6+ inches)
1984/06/14 Rainbow Trout 870 Catchable (6+ inches)
1984/05/23 Rainbow Trout 1,260 Catchable (6+ inches)
1983/06/08 Rainbow Trout 2,004 Catchable (6+ inches)
1982/07/20 Rainbow Trout 2,268 Catchable (6+ inches)
1982/06/10 Rainbow Trout 2,795 Catchable (6+ inches)
1981/06/02 Rainbow Trout 2,040 Catchable (6+ inches)
1980/05/20 Rainbow Trout 3,200 Catchable (6+ inches)
1979/09/08 Rainbow Trout 4,001 Fry (0-3 inches)
1979/07/27 Rainbow Trout 1,600 Catchable (6+ inches)
1979/07/27 Rainbow Trout 8,220 Fry (0-3 inches)
1979/06/06 Rainbow Trout 1,440 Catchable (6+ inches)
1978/06/14 Rainbow Trout 3,190 Catchable (6+ inches)
1977/06/28 Rainbow Trout 2,600 Catchable (6+ inches)
1977/06/27 Rainbow Trout 480 Catchable (6+ inches)
1976/05/27 Rainbow Trout 5,080 Catchable (6+ inches)
1975/06/12 Rainbow Trout 5,070 Catchable (6+ inches)
1974/05/22 Rainbow Trout 2,160 Catchable (6+ inches)
1972/06/06 Rainbow Trout 4,840 Catchable (6+ inches)
1971/05/26 Rainbow Trout 5,000 Catchable (6+ inches)
1970/06/01 Rainbow Trout 5,040 Catchable (6+ inches)
1969/05/22 Rainbow Trout 5,015 Catchable (6+ inches)
1968/05/22 Rainbow Trout 5,130 Catchable (6+ inches)
Source: IDFG Fish Stocking Database.

Licenses and Tags

Learn more about IDFG Licenses, Tags & Permits
 

Fishing Rules, 2025 - 2027

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.

Special Rules

No Special Rules for Mosquito Flat Reservoir.
Salmon Region Bag Limits
Bass (Largemouth and Smallmouth)

  • No bag, length, or possession limits

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 apply when fishing for Brook Trout

Bull Trout

  • Bull Trout - catch-and-release

Kokanee

  • Kokanee limit is 25

Salmon (ocean-run)

  • 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 fishing is illegal. Defined as ocean-run Oncorhynchus nerka longer than 14 inches in the Salmon River drainage (excluding above Mosquito Flat Dam)
  • Fishing for salmon is prohibited unless a salmon season is specifically opened for that water

Steelhead (ocean-run)

  • Defined as Rainbow Trout longer than 20 inches in the Salmon River drainage (excluding the Lemhi and Pahsimeroi rivers, lakes and reservoirs, and ponds)
  • Fishing for steelhead is prohibited unless a steelhead season is specifically opened for that water. See fishing regulations for details

Sturgeon

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

Tiger Muskie

  • Tiger Muskie limit is 2, none under 40 inches

Trout includes Lake Trout, Golden Trout, Arctic Grayling, Cutthroat Trout, Rainbow Trout, Sunapee Trout and trout hybrids (e.g. Tiger Trout)

  • Trout limit is 6, all species combined
  • Chinook Salmon and steelhead placed in ponds are counted in the trout bag limit
  • Bull Trout and Brook Trout 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 apply when fishing for whitefish

Protected Nongame Fish including Pacific Lamprey

  • May not be harvested or possessed

All Other Fish Species includes bullfrogs and crayfish

  • No bag, length, or possession limits
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