Have you checked the river reports? I know there's not a ton of information but some may be helpful. [log in for link]
I fish there normally 3 days each Spring before Memorial Day and again in the fall after Labor day.
I started fishing the river in 2005 with fly only but have since switched to U/L spin for the most part. I still have the longrod with me and use it when a dry fly hatch occurs but have found over the years I average 6-10 fish per hour with the U/L and I can hit places on the river with the plug that I can't reach with the fly rod, just my shortcoming.
A couple recommendations,
Go early, I like to be on the river 1/2 hr before sunrise and usually quit by 10 or 11. In the afternoon 4:00 is a good start time.
It's great when the flow is 125cfs+ and I've fished the river several years ago when it was running a record 1000cfs and it fished very well.
Don't overlook the lower river, the bowl to me is not fun although there obviously are big fish there.
The worse the weather the better the fishing, fewer people more fish, I always hope for rain/snow/wind, it guarantees a great outing and a lot fewer people
. [log in for link]
Frying Pan Anglers is a great resource for information from where/what/when, they also usually have a report on their website.
Hope this helps.
BTW, every fish I've had on the river over 20" has been well below the toilet bowl, my PB was a 29" bow on a wet snowy morning in May.