There is no way that the state is monitoring searun cutthroat abundance or the summer run steelhead run sizes for the S. Fork Nooksack.
Without a doubt both the sea-run cutthroat and summer run steelhead are two of most challenging of our anadromous fish to monitoring their population status. The bull trout would be the next on that list.
In the Puget Sound basin historically, it has been estimated that approximately 2% of its steelhead were native summer-run fish. Those summer fish in the Puget Sound steelhead recovery plan consisted of 5 populations. Those populations with their historic abundance estimate were South Fork Nooksack - 1,920, Deer Creek (NF Stillaguamish) - 3,311, Canyon Creek (SF Stillaguamish) - 530, North Fork Skykomish -728 and forks of the Tolt -1,655. Only the Tolt fish have regularly been monitoring with spawning surveys (going back to the mid-1980s, check SCORE).
The Tolt population was/is the easily monitored. It is spawning grounds is at the lowest elevation and fish spawn below a barrier that is downstream of the Seattle dam (for drinking water). Thus, two of the biggest challenges to consistently surveying the spawning during the March to May period (snow and lack of contrast between new redds and the stream bottom -lack of algae) are minimized). In some parts of the west during low flows late summer/early fall snorkel have used. On at least on the Tolt there was little relationship between such snorkel adult counts and the number redds seen the following spring. Recently a mark/recapture efforts on Deer Creek has shown some promise but even that has its own set of problems.
Recognizing those difficult survey conditions the old Department of Wildlife after the regularly marking of the hatchery smolts adopt regulations requiring the release of all unmarked steelhead during the summer in the Puget Sound region about 1985. As you can see in the Tolt summer steelhead escapement numbers there was an increase in the escapement numbers for a decade (reflecting the success of the regulation change?) but then decline to lower levels which have continued to today. Suspect much of the depressed production reflect conditions in marine waters (both Puget Sound and the ocean).
With laddering/truck and hauling) at the barriers on the South Fork Stillaguamish (Granite falls) and South Fork Skykomish (Sunset Falls) additional 'wild" populations have become established in both basins. Through the WDFW hatchery reports one can track how the number of unmarked fish are being trucked over Sunset Falls.
Bottom line as long as Puget Sound steelhead are ESA listed, I doubt that we will see any directed fishery (even CnR) at the region's wild summer steelhead. Though I suppose there is a small chance at either the Tolt or South Fork of Skykomish if the counts shown significant increases in abundances and an approved river management plans were developed.
Curt