Fourth Fork Rock Creek

Tributary of the Rock Creek

    Fourth Fork Rock Creek in Cassia and Twin Falls Counties is 6.8 miles in length.

    Interactive Map
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    Species Observed in Surveys

    Fish Stocking Records

    Date Species Quantity General Size
    2016/10/12 Brown Trout 2,256 Catchable (6+ inches)
    2015/06/10 Rainbow Trout - Triploid 1,335 Catchable (6+ inches)
    2014/10/22 Brown Trout 4,966 Catchable (6+ inches)
    2005/08/09 Rainbow Trout - Triploid 1,620 Catchable (6+ inches)
    2005/07/25 Rainbow Trout - Triploid 1,190 Catchable (6+ inches)
    2005/07/11 Rainbow Trout - Triploid 1,190 Catchable (6+ inches)
    2005/06/22 Brown Trout 2,420 Fingerling (3-6 inches)
    2005/06/20 Rainbow Trout - Triploid 98 Catchable (6+ inches)
    2005/05/16 Rainbow Trout - Triploid 812 Catchable (6+ inches)
    2004/07/27 Rainbow Trout - Triploid 85 Catchable (6+ inches)
    2004/06/22 Rainbow Trout - Triploid 336 Catchable (6+ inches)
    2004/05/14 Rainbow Trout - Triploid 504 Catchable (6+ inches)
    2004/04/27 Brown Trout 9,064 Fry (0-3 inches)
    2002/12/13 Rainbow Trout 747 Catchable (6+ inches)
    2002/08/28 Rainbow Trout - Triploid 780 Catchable (6+ inches)
    2002/08/09 Rainbow Trout - Triploid 774 Catchable (6+ inches)
    2002/07/19 Rainbow Trout - Triploid 925 Catchable (6+ inches)
    2002/07/02 Rainbow Trout - Triploid 925 Catchable (6+ inches)
    2002/05/24 Rainbow Trout - Triploid 754 Catchable (6+ inches)
    2001/07/27 Rainbow Trout - Triploid 675 Catchable (6+ inches)
    2000/09/01 Rainbow Trout - Triploid 800 Catchable (6+ inches)
    2000/08/11 Rainbow Trout - Triploid 775 Catchable (6+ inches)
    2000/07/28 Rainbow Trout - Triploid 925 Catchable (6+ inches)
    2000/07/14 Rainbow Trout - Triploid 925 Catchable (6+ inches)
    2000/06/29 Rainbow Trout - Triploid 850 Catchable (6+ inches)
    2000/06/16 Rainbow Trout - Triploid 500 Catchable (6+ inches)
    2000/05/26 Rainbow Trout - Triploid 500 Catchable (6+ inches)
    2000/05/24 Rainbow Trout - Triploid 500 Catchable (6+ inches)
    1999/09/03 Rainbow Trout 775 Catchable (6+ inches)
    1999/08/13 Rainbow Trout 775 Catchable (6+ inches)
    1999/07/30 Rainbow Trout 900 Catchable (6+ inches)
    1999/07/16 Rainbow Trout 900 Catchable (6+ inches)
    1999/07/02 Rainbow Trout 900 Catchable (6+ inches)
    1999/06/25 Rainbow Trout 500 Catchable (6+ inches)
    1999/05/28 Rainbow Trout 500 Catchable (6+ inches)
    1998/09/04 Rainbow Trout 775 Catchable (6+ inches)
    1998/08/14 Rainbow Trout 775 Catchable (6+ inches)
    1998/07/31 Rainbow Trout 925 Catchable (6+ inches)
    1998/07/24 Rainbow Trout 925 Catchable (6+ inches)
    1998/07/01 Rainbow Trout 1,350 Catchable (6+ inches)
    1998/06/12 Rainbow Trout 600 Catchable (6+ inches)
    1998/05/22 Rainbow Trout 500 Catchable (6+ inches)
    1997/08/29 Rainbow Trout 675 Catchable (6+ inches)
    1997/08/14 Rainbow Trout 700 Catchable (6+ inches)
    1997/08/01 Rainbow Trout 925 Catchable (6+ inches)
    1997/07/17 Rainbow Trout 925 Catchable (6+ inches)
    1997/07/01 Rainbow Trout 1,450 Catchable (6+ inches)
    1997/06/30 Rainbow Trout 600 Catchable (6+ inches)
    1996/09/20 Rainbow Trout 625 Catchable (6+ inches)
    1996/08/29 Rainbow Trout 1,400 Catchable (6+ inches)
    1996/08/09 Rainbow Trout 1,000 Catchable (6+ inches)
    1996/07/26 Rainbow Trout 1,000 Catchable (6+ inches)
    1996/07/02 Rainbow Trout 1,200 Catchable (6+ inches)
    1995/06/30 Rainbow Trout 3,158 Catchable (6+ inches)
    1995/05/26 Rainbow Trout 1,742 Catchable (6+ inches)
    1994/09/16 Rainbow Trout - Triploid 675 Catchable (6+ inches)
    1994/09/01 Rainbow Trout 775 Catchable (6+ inches)
    1994/09/01 Rainbow Trout - Triploid 775 Catchable (6+ inches)
    1994/08/12 Rainbow Trout - Triploid 775 Catchable (6+ inches)
    1994/07/27 Rainbow Trout - Triploid 775 Catchable (6+ inches)
    1994/06/30 Rainbow Trout - Triploid 775 Catchable (6+ inches)
    1994/06/15 Rainbow Trout - Triploid 775 Catchable (6+ inches)
    1994/06/03 Rainbow Trout - Triploid 775 Catchable (6+ inches)
    1994/05/27 Rainbow Trout - Triploid 3,300 Catchable (6+ inches)
    1993/09/13 Rainbow Trout 675 Catchable (6+ inches)
    1993/08/03 Rainbow Trout 190 Catchable (6+ inches)
    1993/07/19 Rainbow Trout 790 Catchable (6+ inches)
    1993/06/22 Rainbow Trout 700 Catchable (6+ inches)
    1992/09/10 Rainbow Trout 350 Catchable (6+ inches)
    1992/08/11 Rainbow Trout 350 Catchable (6+ inches)
    1992/06/29 Rainbow Trout 700 Catchable (6+ inches)
    1992/06/09 Rainbow Trout - Triploid 348 Catchable (6+ inches)
    1992/05/18 Rainbow Trout - Triploid 350 Catchable (6+ inches)
    1990/09/10 Rainbow Trout 363 Catchable (6+ inches)
    1990/08/14 Rainbow Trout 350 Catchable (6+ inches)
    1990/07/25 Rainbow Trout 350 Catchable (6+ inches)
    1990/06/21 Rainbow Trout 360 Catchable (6+ inches)
    1990/05/14 Rainbow Trout 361 Catchable (6+ inches)
    1989/08/23 Rainbow Trout 174 Catchable (6+ inches)
    1989/07/13 Rainbow Trout 314 Catchable (6+ inches)
    1989/06/21 Rainbow Trout 352 Catchable (6+ inches)
    1989/05/18 Rainbow Trout 1,000 Fingerling (3-6 inches)
    1988/09/13 Rainbow Trout 378 Catchable (6+ inches)
    1988/08/09 Rainbow Trout 378 Catchable (6+ inches)
    1988/07/11 Rainbow Trout 535 Catchable (6+ inches)
    1988/06/06 Rainbow Trout 362 Catchable (6+ inches)
    1987/09/18 Rainbow Trout 361 Catchable (6+ inches)
    1987/08/04 Rainbow Trout 360 Catchable (6+ inches)
    1987/07/08 Rainbow Trout 348 Catchable (6+ inches)
    1987/06/11 Rainbow Trout 350 Catchable (6+ inches)
    1987/05/15 Rainbow Trout 1,008 Catchable (6+ inches)
    1986/09/30 Rainbow Trout 460 Catchable (6+ inches)
    1986/08/19 Rainbow Trout 350 Catchable (6+ inches)
    1986/07/10 Rainbow Trout 360 Catchable (6+ inches)
    1986/06/20 Rainbow Trout 352 Catchable (6+ inches)
    1985/06/04 Rainbow Trout 435 Catchable (6+ inches)
    1984/08/23 Rainbow Trout 230 Catchable (6+ inches)
    1983/08/31 Rainbow Trout 230 Catchable (6+ inches)
    1983/06/20 Rainbow Trout 430 Catchable (6+ inches)
    1980/08/27 Rainbow Trout 495 Catchable (6+ inches)
    1978/09/06 Rainbow Trout 3,360 Catchable (6+ inches)
    1972/08/31 Cutthroat Trout - Unspecified 4,860 Fry (0-3 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 Fourth Fork Rock Creek.
    Magic Valley 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 apply when fishing for Brook Trout

    Bull Trout

    • Bull Trout - catch-and-release

    Kokanee

    • Kokanee limit is 6

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

    • Trout limit is 6, all species combined
    • In rivers and streams, only 2 of the 6 trout may be Cutthroat Trout
    • Bull Trout and Brook Trout are listed separately

    Walleye

    • Walleye limit is 6

    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 includes Northern Leatherside Chub, Shoshone Sculpin, Wood River Sculpin, and Bluehead Sucker (also known as Green Sucker)

    • May not be harvested or possessed

    All Other Fish Species includes bullfrogs and crayfish

    • No bag, length or possession limit
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