From the Hatchery Scientific Review Group 2009 doc:

The program currently releases approximately 500,000 from Fallert Creek Hatchery and Gobar Pond. All releases are adipose-marked and approximately 250,000 are adipose-marked and coded-wire tagged. Approximately 300 broodstock, collected at the ladder at Kalama Falls Hatchery, are needed to support the program.
The Kalama River hatchery broodstock was originally taken from Cowlitz and Carson hatchery stocks in the 1970s. Since then, this stock has been propagated largely from returns to the hatchery; however, eggs and adults have been brought in from numerous lower Columbia hatcheries including Eagle Creek and Willamette (Oregon), Cowlitz and Little White Salmon Rivers.
The program uses single family pairing. Few jacks are incorporated into the broodstock. Average smolt to adult survival for the hatchery program has been 0.17% for brood years 1990 through 1998. The HGMP for this program indicates that contribution to fisheries has been extremely low, with total annual catch from the program averaging less than 300 fish for return years 1995 through 2001.
The current hatchery program is described as an integrated harvest program. However, since no natural-origin fish are included in the hatchery broodstock, the current proportionate natural influence (PNI) is zero. The current estimate of the proportion of hatchery-origin spawners (pHOS) in the total spawning population is 52%. Hatchery returns are projected to exceed broodstock needs by approximately 1,200 fish annually.
 Estimated Productivity (with harvest): 0.54.
 Projected Average Natural-Origin Escapement: 146 fish

BTW, the HSRG made recommendations regarding the control of BKD (Bacterial Kidney Disease), which has been a problem with the Kalama's hatchery chinook stocks. Apparently, releasing 500,000 salmon smolt only produces a large return if they are healthy salmon smolt.......