Walleye abundance on Lake Roosevelt has declined slightly since 2010, however, what we are seeing now is very similar to what we saw from 2002–2005.
Scooteney walleye abundance is very close to the long-term (2002-2012) average. The biggest decline was in 2011, but in 2012 abundance increased.
Billy Clapp has never been a high density walleye population but there are still walleye there. The abundance of walleye in BC has changed very little since 2005. There is likley very little natural production of walleye on BC. Most walleye come down from Banks Lake.
The abundance of walleye in Evergreen Reservoir is stable. I wouldn't say it was ever high. There are still walleye to be caught.
Sprague Lake had one of the most abundant walleye populations anywhere. The problem was, angler use and catch rates were low. Resort owners were reporting "no walleye" in the lake and their business was suffering. The only species more abundant than walleye (in 2003) was black crappie. Most crappie were small and perfectly sized for walleye to eat.
The following is from my 2003 Sprague Lake report:
A total of 572 walleye were collected during this survey; the majority (85%), and the largest fish
were collected in gill nets (Figure 12). Walleye ranged in size from 296-722 mm and most fish
(86%) were of harvestable size (> 16 in.) (Figure 12). Walleye ranged in age from one to 15
years; however, no age 12 or 13 walleye were collected and the majority (65%) were age five or
six (Figure 13). Walleye were in fair condition and relative weights averaged 98, slightly below
the national average (Figure 14). We were unable to determine the sex of 32 walleye. These fish
were YOY, and gonad and visceral fat weights were less than 1 gram. Of fish in which the sex
could be determined, 64 percent (n = 313) were male and 36 percent (n = 177) were female.
Female walleye were larger than males (with regard to length and weight), had more visceral fat,
and had heavier gonads (p < .0005). While collecting and weighing visceral fat, we noted that a
large number of walleye had crappie in their stomach, which appeared to be age zero and one
This report can be found here: http://wdfw.wa.gov/publications/00278/
If anglers were catching walleye we sure didn't see them, and we spent a lot of time monitoring that fishery, and the folks at the resort weren't seeing them, and they live there.
Sprague Lake was rehabbed in 2007 in order to jump-start the warmwater fishery. We re-stocked with largemouth bass, crappie and bluegill (I personally stocked 1000's). Rainbow trout were stocked in order to create a transitional fishery until the warmwater fish could become established. We likely need to stock more bass and crappie, but Sprague is NOT being managed as a "trout fishery".