Big Lost River

Tributary of the Dry Channel Big Lost River

  • Recommended Fishing Water

Big Lost River in Butte and Custer Counties is 134.9 miles in length.

The Big Lost River drainage provides a high quality stream fishery for anglers. Species present include brook trout, rainbow trout, cutthroat trout and mountain whitefish. The scenery is outstanding, particularly in the upper reaches of the river. The river is intermittently dewatered downstream of the Blaine Diversion near the Rothwell Access site.

Facilities

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

Directions

The Big Lost River drainage is located on the western edge of the Upper Snake Region. The river runs through the town of Mackay, and extends upstream to the Copper Basin. Make sure you have all the supplies you need before venturing past Mackay, as there are no services past this point. See the Fishing Planner Interactive Mapper for detailed information on facilities and access sites.

Recommended Game Fish

Species Observed in Surveys

Fish Stocking Records

Date Species Quantity General Size
2021/07/12 Rainbow Trout 948 Greater than 6 inches
2021/06/21 Rainbow Trout 1,498 Greater than 6 inches
2019/06/28 Rainbow Trout 3,000 Greater than 6 inches
2017/04/27 Rainbow Trout 252 Adults
2016/10/14 Cutthroat Trout 19,910 Less than 6 inches
2016/09/22 Rainbow Trout 1,000 Greater than 6 inches
2016/04/13 Rainbow Trout 4,512 Less than 6 inches
2006/09/22 Rainbow Trout 1,710 Greater than 6 inches
2006/09/20 Rainbow Trout 1,020 Greater than 6 inches
2003/06/25 Rainbow Trout 26,400 Less than 6 inches
2002/07/22 Rainbow Trout 900 Greater than 6 inches
2002/07/08 Rainbow Trout 500 Greater than 6 inches
2002/06/26 Rainbow Trout 500 Greater than 6 inches
2002/06/10 Rainbow Trout 525 Greater than 6 inches
2001/08/24 Rainbow Trout 350 Greater than 6 inches
2001/07/24 Rainbow Trout 518 Greater than 6 inches
2001/07/10 Rainbow Trout 500 Greater than 6 inches
2001/06/19 Rainbow Trout 500 Greater than 6 inches
2001/06/05 Rainbow Trout 499 Greater than 6 inches
2001/06/01 Rainbow Trout 400 Greater than 6 inches
2000/07/24 Rainbow Trout 500 Greater than 6 inches
2000/07/10 Rainbow Trout 500 Greater than 6 inches
2000/06/26 Rainbow Trout 500 Greater than 6 inches
2000/06/13 Rainbow Trout 500 Greater than 6 inches
1999/07/20 Rainbow Trout 612 Greater than 6 inches
1999/07/13 Rainbow Trout 340 Greater than 6 inches
1998/07/21 Rainbow Trout 1,013 Greater than 6 inches
1998/07/07 Rainbow Trout 585 Greater than 6 inches
1998/06/22 Rainbow Trout 1,050 Greater than 6 inches
1998/06/09 Rainbow Trout 578 Greater than 6 inches
1997/08/08 Rainbow Trout 120 Greater than 6 inches
1997/07/22 Rainbow Trout 576 Greater than 6 inches
1997/07/09 Rainbow Trout 580 Greater than 6 inches
1996/08/20 Rainbow Trout 60 Adults
1996/07/22 Rainbow Trout 780 Greater than 6 inches
1996/07/08 Rainbow Trout 750 Greater than 6 inches
1996/06/27 Rainbow Trout 1,500 Greater than 6 inches
1995/07/25 Rainbow Trout 756 Greater than 6 inches
1995/07/19 Rainbow Trout 760 Greater than 6 inches
1995/07/10 Rainbow Trout 750 Greater than 6 inches
1995/06/29 Rainbow Trout 791 Greater than 6 inches
1994/07/15 Rainbow Trout 750 Greater than 6 inches
1994/07/01 Rainbow Trout 790 Greater than 6 inches
1994/06/17 Rainbow Trout 765 Greater than 6 inches
1994/06/03 Rainbow Trout 590 Greater than 6 inches
1994/05/27 Rainbow Trout 167 Greater than 6 inches
1993/07/29 Rainbow Trout 750 Greater than 6 inches
1993/07/15 Rainbow Trout 787 Greater than 6 inches
1993/06/29 Rainbow Trout 760 Greater than 6 inches
1993/06/10 Rainbow Trout 760 Greater than 6 inches
1992/07/17 Rainbow Trout 570 Greater than 6 inches
1992/07/06 Rainbow Trout 475 Greater than 6 inches
1992/06/26 Rainbow Trout 256 Greater than 6 inches
1992/06/19 Rainbow Trout 475 Greater than 6 inches
1992/06/10 Rainbow Trout 247 Greater than 6 inches
1992/06/04 Rainbow Trout 247 Greater than 6 inches
1992/05/22 Rainbow Trout 440 Greater than 6 inches
1991/07/16 Rainbow Trout 850 Greater than 6 inches
1991/07/03 Rainbow Trout 756 Greater than 6 inches
1991/06/14 Rainbow Trout 770 Greater than 6 inches
1991/05/30 Rainbow Trout 813 Greater than 6 inches
1990/07/25 Rainbow Trout 750 Greater than 6 inches
1990/07/18 Rainbow Trout 250 Greater than 6 inches
1990/07/11 Rainbow Trout 750 Greater than 6 inches
1990/06/13 Rainbow Trout 750 Greater than 6 inches
1990/06/01 Rainbow Trout 750 Greater than 6 inches
1989/07/20 Rainbow Trout 800 Greater than 6 inches
1989/06/08 Rainbow Trout 1,476 Greater than 6 inches
1988/07/21 Rainbow Trout 1,540 Greater than 6 inches
1988/07/07 Rainbow Trout 1,680 Greater than 6 inches
1988/06/28 Rainbow Trout 1,540 Greater than 6 inches
1988/06/07 Rainbow Trout 1,650 Greater than 6 inches
1987/07/27 Rainbow Trout 440 Greater than 6 inches
1987/07/21 Rainbow Trout 1,320 Greater than 6 inches
1987/07/15 Brown Trout 37,060 Less than 6 inches
1987/07/14 Brown Trout 29,920 Less than 6 inches
1987/06/30 Rainbow Trout 2,640 Greater than 6 inches
1987/06/10 Rainbow Trout 220 Greater than 6 inches
1987/06/08 Rainbow Trout 2,640 Greater than 6 inches
1987/05/21 Rainbow Trout 220 Greater than 6 inches
1987/05/20 Rainbow Trout 2,640 Greater than 6 inches
1986/08/05 Rainbow Trout 4,650 Greater than 6 inches
1986/08/04 Rainbow Trout 1,500 Greater than 6 inches
1986/07/14 Brown Trout 81,600 Less than 6 inches
1986/07/14 Rainbow Trout 4,650 Greater than 6 inches
1986/07/11 Rainbow Trout 1,500 Greater than 6 inches
1985/07/18 Rainbow Trout 756 Greater than 6 inches
1985/07/02 Rainbow Trout 4,951 Greater than 6 inches
1985/06/12 Rainbow Trout 2,040 Greater than 6 inches
1985/05/22 Rainbow Trout 1,500 Greater than 6 inches
1985/05/16 Rainbow Trout 2,500 Greater than 6 inches
1984/08/03 Brown Trout 29,575 Less than 6 inches
1984/07/25 Rainbow Trout 9,400 Greater than 6 inches
1984/07/24 Rainbow Trout 4,700 Greater than 6 inches
1983/08/29 Rainbow Trout 4,568 Less than 6 inches
1983/08/25 Rainbow Trout 1,575 Less than 6 inches
1983/07/25 Rainbow Trout 5,250 Greater than 6 inches
1983/07/01 Rainbow Trout 1,576 Greater than 6 inches
1982/08/24 Rainbow Trout 1,560 Greater than 6 inches
1982/08/13 Rainbow Trout 1,045 Greater than 6 inches
1982/07/21 Rainbow Trout 1,440 Greater than 6 inches
1982/07/15 Rainbow Trout 2,990 Greater than 6 inches
1982/05/26 Rainbow Trout 3,600 Greater than 6 inches
1981/08/20 Rainbow Trout 812 Greater than 6 inches
1981/07/31 Rainbow Trout 1,612 Greater than 6 inches
1981/07/02 Rainbow Trout 11,410 Greater than 6 inches
1981/05/22 Rainbow Trout 1,800 Greater than 6 inches
1981/05/13 Rainbow Trout 2,400 Greater than 6 inches
1980/10/17 Brook Trout 150 Adults
1980/08/29 Rainbow Trout 2,160 Greater than 6 inches
1980/08/15 Rainbow Trout 1,500 Greater than 6 inches
1980/08/08 Rainbow Trout 540 Greater than 6 inches
1980/08/07 Rainbow Trout 1,620 Greater than 6 inches
1980/07/25 Rainbow Trout 1,400 Greater than 6 inches
1980/07/02 Rainbow Trout 1,860 Greater than 6 inches
1980/05/19 Rainbow Trout 4,000 Greater than 6 inches
1979/07/13 Rainbow Trout 1,980 Greater than 6 inches
1979/06/13 Rainbow Trout 2,300 Greater than 6 inches
1979/05/23 Rainbow Trout 4,830 Greater than 6 inches
1978/08/25 Rainbow Trout 3,080 Greater than 6 inches
1978/08/23 Rainbow Trout 220 Greater than 6 inches
1978/08/15 Brook Trout 495 Less than 6 inches
1978/08/10 Rainbow Trout 4,440 Greater than 6 inches
1978/07/27 Rainbow Trout 1,665 Greater than 6 inches
1978/07/11 Rainbow Trout 2,988 Greater than 6 inches
1978/06/27 Rainbow Trout 2,520 Greater than 6 inches
1978/05/24 Rainbow Trout 2,700 Greater than 6 inches
1977/09/12 Rainbow Trout 8,401 Less than 6 inches
1977/08/02 Rainbow Trout 2,520 Greater than 6 inches
1977/06/21 Rainbow Trout 1,440 Greater than 6 inches
1977/05/24 Rainbow Trout 1,320 Greater than 6 inches
1976/08/03 Rainbow Trout 2,900 Greater than 6 inches
1976/07/13 Rainbow Trout 2,062 Greater than 6 inches
1976/07/02 Rainbow Trout 2,160 Greater than 6 inches
1976/05/26 Rainbow Trout 4,800 Greater than 6 inches
1975/09/29 Rainbow Trout 5,600 Greater than 6 inches
1975/09/04 Rainbow Trout 3,300 Greater than 6 inches
1975/09/03 Rainbow Trout 3,800 Greater than 6 inches
1975/08/13 Rainbow Trout 2,000 Greater than 6 inches
1975/08/06 Rainbow Trout 1,920 Greater than 6 inches
1975/07/22 Rainbow Trout 4,800 Greater than 6 inches
1975/06/13 Rainbow Trout 4,200 Greater than 6 inches
1975/05/21 Rainbow Trout 3,800 Greater than 6 inches
1974/09/06 Rainbow Trout 3,500 Greater than 6 inches
1974/09/03 Rainbow Trout 3,360 Greater than 6 inches
1974/08/26 Rainbow Trout 3,300 Greater than 6 inches
1974/08/16 Rainbow Trout 1,920 Greater than 6 inches
1974/08/06 Rainbow Trout 2,160 Greater than 6 inches
1974/07/16 Rainbow Trout 2,160 Greater than 6 inches
1974/07/15 Rainbow Trout 1,800 Greater than 6 inches
1974/07/02 Rainbow Trout 3,500 Greater than 6 inches
1974/05/16 Rainbow Trout 1,800 Greater than 6 inches
1973/08/20 Rainbow Trout 2,200 Greater than 6 inches
1973/08/13 Rainbow Trout 2,800 Greater than 6 inches
1973/08/02 Rainbow Trout 2,040 Greater than 6 inches
1973/08/01 Rainbow Trout 1,360 Greater than 6 inches
1973/07/26 Brook Trout 15 Greater than 6 inches
1973/07/26 Rainbow Trout 45 Greater than 6 inches
1973/07/19 Rainbow Trout 1,800 Greater than 6 inches
1973/07/12 Rainbow Trout 3,200 Greater than 6 inches
1973/07/02 Rainbow Trout 4,480 Greater than 6 inches
1973/06/13 Rainbow Trout 3,840 Greater than 6 inches
1973/06/12 Rainbow Trout 1,920 Greater than 6 inches
1973/05/29 Rainbow Trout 3,840 Greater than 6 inches
1973/05/25 Rainbow Trout 1,440 Greater than 6 inches
1973/05/16 Brook Trout 600 Less than 6 inches
1973/05/16 Rainbow Trout 2,400 Less than 6 inches
1973/05/03 Rainbow Trout 4,560 Greater than 6 inches
1973/04/11 Rainbow Trout 3,900 Greater than 6 inches
1972/08/23 Rainbow Trout 900 Greater than 6 inches
1972/08/22 Rainbow Trout 3,720 Greater than 6 inches
1972/08/17 Rainbow Trout 1,680 Greater than 6 inches
1972/08/10 Rainbow Trout 3,120 Greater than 6 inches
1972/07/26 Rainbow Trout 1,800 Greater than 6 inches
1972/07/19 Rainbow Trout 6,080 Greater than 6 inches
1972/07/13 Rainbow Trout 1,680 Greater than 6 inches
1972/07/06 Rainbow Trout 4,080 Greater than 6 inches
1972/06/27 Rainbow Trout 3,600 Greater than 6 inches
1972/06/26 Rainbow Trout 1,500 Greater than 6 inches
1972/05/30 Brook Trout 240 Less than 6 inches
1972/05/30 Mountain Whitefish 320 Less than 6 inches
1972/05/30 Rainbow Trout 1,280 Greater than 6 inches
1972/05/17 Rainbow Trout 4,080 Greater than 6 inches
1972/04/19 Rainbow Trout 4,030 Greater than 6 inches
1971/09/14 Rainbow Trout 5,020 Greater than 6 inches
1971/09/08 Rainbow Trout 3,125 Greater than 6 inches
1971/09/07 Rainbow Trout 3,500 Greater than 6 inches
1971/08/27 Rainbow Trout 1,550 Greater than 6 inches
1971/08/25 Rainbow Trout 2,160 Greater than 6 inches
1971/08/18 Rainbow Trout 2,280 Greater than 6 inches
1971/08/10 Rainbow Trout 2,280 Greater than 6 inches
1971/08/02 Rainbow Trout 2,100 Greater than 6 inches
1971/07/28 Rainbow Trout 1,920 Greater than 6 inches
1971/07/26 Rainbow Trout 1,740 Greater than 6 inches
1971/07/19 Rainbow Trout 2,100 Greater than 6 inches
1971/07/13 Rainbow Trout 1,500 Greater than 6 inches
1971/07/08 Rainbow Trout 2,080 Greater than 6 inches
1971/06/30 Rainbow Trout 3,600 Greater than 6 inches
1971/05/26 Rainbow Trout 6,480 Greater than 6 inches
1971/04/09 Rainbow Trout 4,900 Greater than 6 inches
1970/08/31 Rainbow Trout 1,500 Greater than 6 inches
1970/08/27 Rainbow Trout 1,920 Greater than 6 inches
1970/08/24 Rainbow Trout 3,840 Greater than 6 inches
1970/08/19 Rainbow Trout 3,120 Greater than 6 inches
1970/08/18 Rainbow Trout 1,920 Greater than 6 inches
1970/08/07 Rainbow Trout 2,400 Greater than 6 inches
1970/07/31 Rainbow Trout 3,400 Greater than 6 inches
1970/07/30 Rainbow Trout 2,220 Greater than 6 inches
1970/07/22 Rainbow Trout 2,560 Greater than 6 inches
1970/07/13 Rainbow Trout 1,920 Greater than 6 inches
1970/07/02 Rainbow Trout 2,320 Greater than 6 inches
1970/06/18 Rainbow Trout 1,860 Greater than 6 inches
1970/06/03 Rainbow Trout 4,200 Greater than 6 inches
1970/05/19 Rainbow Trout 2,280 Greater than 6 inches
1970/05/06 Brook Trout 1,200 Less than 6 inches
1970/05/06 Rainbow Trout 480 Greater than 6 inches
1970/04/09 Rainbow Trout 1,500 Greater than 6 inches
1970/04/04 Brook Trout 600 Less than 6 inches
1970/04/04 Mountain Whitefish 1,200 Less than 6 inches
1970/04/04 Rainbow Trout 200 Less than 6 inches
1969/09/10 Rainbow Trout 1,750 Less than 6 inches
1969/08/28 Rainbow Trout 1,920 Less than 6 inches
1969/08/27 Rainbow Trout 5,280 Greater than 6 inches
1969/08/25 Rainbow Trout 4,200 Greater than 6 inches
1969/08/19 Rainbow Trout 4,560 Greater than 6 inches
1969/08/05 Rainbow Trout 4,200 Greater than 6 inches
1969/07/31 Rainbow Trout 2,640 Greater than 6 inches
1969/07/30 Rainbow Trout 2,800 Greater than 6 inches
1969/07/15 Rainbow Trout 3,960 Greater than 6 inches
1969/07/01 Rainbow Trout 1,920 Greater than 6 inches
1968/09/16 Rainbow Trout 3,600 Greater than 6 inches
1968/09/06 Rainbow Trout 3,600 Greater than 6 inches
1968/08/29 Rainbow Trout 1,400 Greater than 6 inches
1968/08/23 Rainbow Trout 2,100 Greater than 6 inches
1968/08/07 Rainbow Trout 2,700 Greater than 6 inches
1968/07/23 Rainbow Trout 1,500 Greater than 6 inches
1968/07/22 Rainbow Trout 1,500 Greater than 6 inches
1968/07/16 Rainbow Trout 1,560 Greater than 6 inches
1968/07/10 Rainbow Trout 1,620 Greater than 6 inches
1968/06/18 Rainbow Trout 1,740 Greater than 6 inches
1968/05/28 Rainbow Trout 1,500 Greater than 6 inches
1968/05/08 Rainbow Trout 3,990 Greater than 6 inches
1968/04/24 Rainbow Trout 1,720 Greater than 6 inches
1968/04/02 Rainbow Trout 5,280 Greater than 6 inches
Source: IDFG Fish Stocking Database.

Licenses and Tags

Learn more about IDFG Licenses, Tags & Permits
 

The Big Lost River has a 6-trout limit from Memorial Day weekend to December 1, and is one of the few places where anglers can harvest Yellowstone Cutthroat Trout from a stream. However, please remember Mountain Whitefish are catch-and-release only year-round to protect this unique population. 

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

Big Lost River and tributaries
  • December 1 through Friday before Memorial Day weekend - trout limit is 0, catch-and-release; whitefish limit is 0, catch-and-release
  • Saturday of Memorial Day weekend through November 30 - trout limit is 6; whitefish limit is 0, catch-and-release
Upper Snake Region Bag Limits
Bass (Largemouth and Smallmouth)

  • Bass limit is 6, both species combined

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 15

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, Golden Trout, Lake Trout, Splake, Arctic Grayling, Cutthroat Trout, Rainbow Trout, and 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 - see Big Lost River exception
  • 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 including Northern Leatherside Chub and Bluehead Sucker (also known as Green Sucker)

  • May not be harvested or possessed

All Other Fish Species includes bullfrogs and crayfish

  • No bag, size or possession limit
Find an error? Please let us know what is wrong so we can get it fixed up! Report a Problem