What would those returns be like if you hadn't done that habitat work? - sure the # of salmon didn't increase as hoped, but did it decrease and if it did decrease, was the decrease slowed? What is the baseline? I agree with your point that you have to see results in order to claim a success. Everything that's been posted except the issue w/ upland and 932 has the success associated with it though.
You can extrapolate how those programs will go based on other states, however. CO, UT, WY and others have a similar approach as 932 using different funding sources, etc. Those programs have a proven track record of increasing habitat uplift and conserving critical species. The wildlife crossings work as well has parallels in other states that show remarkable drops in animal/vehicle collisions, etc.
It often seems like people are looking for a one-time, final fix for all that ails the world. Nothing works like that, especially something as complex and controversial as wildlife management & conservation. Reviewing programs that work as well as that don't work means you should constantly be looking at ways to improve based on what you've done in the past. Reintroductions are good example: The work done in the early 20th and post war years could not happen today in terms of elk transplants. Agencies would be reticent to do this due to disease issues such as brucellosis and CWD, habitat concerns etc. In the 1950's, those issues weren't nearly as prevalent as they are today, or well understood. So things change, adapt and hopefully improve.