Lost Creek Kokanee Regulation.

[dubob]

#1: At Strawberry Reservoir, Scofield Reservoir, Lost Creek Reservoir and Panguitch Lake, you may not fillet trout and salmon, and you may not remove their heads or tails while in the field or in transit.

#2: Lost Creek Reservoir, Morgan County •Limit 4 trout (a combined total). •No more than 3 trout may be under 15 inches. •No more than 1 trout may be over 22 inches. •All trout between 15 and 22 inches must be immediately released. •Trout and salmon may not be filleted, and their heads or tails may not be removed in the field or in transit. •CLOSED to fishing 10 p.m. to 6 a.m. daily.

#3: •Note: Kokanee salmon are considered to be part of the total trout limit. Anglers may not possess kokanee salmon at any waterbody statewide from Sept. 10 through Nov. 30.

#4: Trout means species of the family Salmonidae, including rainbow, albino, cutthroat, brown, golden, brook, lake/mackinaw, kokanee salmon, and grayling or any hybrid of the foregoing. Trout does not include whitefish or Bonneville cisco.

I would say from all of the above from the 2022 Guidebook, that the kokanee in Lost Creek are considered part of your 'trout' limit and you may NOT keep any kokanee between 15" and 22".  I am not aware of any gates at Lost Creek, but the rules explicitely state you can't fish between 10 PM and 6 AM.