In Utah we have a few "larger" rivers, the Provo and Green jump to mind, with a few others throughout the state. For Utah these are larger rivers even though when compared to the large rivers of the Northwest or the East, they would be considered streams and creeks themselves. Because these rivers are "bigger" and are considered blue-ribbon fisheries, they get a ton of pressure, and rightly so. Per mile, the Provo River is estimated to have 3,000 fish per mile, the Green River has somewhere between 8,000-22,000 fish per mile, that's a lot of fish for the catching.
However, everyone and their dog want to catch one of those fish. On a regular day, even in the cold of winter, the parking lots for these rivers can get full early in the day and parking may extend to the roads-proper that follow along the river. Actually getting to a decent hole means getting up early, hoping that someone else didn't get up earlier. And the fish know all of this as well!
This is the lot of big rivers that get hit hard day in and day out! We grew up on the Provo River and unless I have only thirty minutes to kill, I won't fish it. I leave it to the fly-fishermen who want to show off their $1,000 rod with their $150 vest while they lose $4.00 flies in the tree behind them. Big Rivers have been lost to the vest-jockeys!
Now, the fish in these rivers aren't dumb, we've gone away more times than we would like to admit wondering what we did wrong and why we couldn't hook one or bring it to hand. But these fish aren't spooky either. If you pull a fish out of a hole, there's a chance that you might catch two or three more before putting the hole down. These small rivers usually take some work to fish, either getting to them or actually getting a fly on the water. Either way, the effort makes each fish more fun to catch. While we usually won't knock anyone for fishing the big rivers, unless their nothing more than a vest-jockey, we'll stay to our small rivers and we'll have big fun! As always, Good Luck and Guid Luck!!