What you will find out about the Savage is that certain sections hold different species just like other streams. You rarely will find rainbows in the trophy section in between the two swinging bridges, once in a while I would see one cruising by the deck or in the dam pool below the upper swinging bridge. The lower end obviously from migratory N. Branch Rainbows is always full of rainbows all the way up until about 200 yards past the bridge that goes across the Savage upstream; there are two legit pools that are always full of rainbows. Then they seem to stop there for whatever reason. The 7X Flats above the upper suspension usually has some rainbows in the head but rarely do I pick up rainbows past that hole until you get to the PH. D hole. Then as you start getting into "Shrimp Land" aka the forbidden section towards the dam that is covered with green slime and some of the biggest freshwater scuds you will ever find, you will catch some thick bows from the reservoir. Brookies are spread throughout the whole system though, if you fish the water most people walk by you will be amazed of how many little guys will nip at your fly. Sheehan and others may disagree with me but when I used to fish it heavily prior to the last couple years those were some of my findings.
When I was just starting to be "successful" on the Savage I used to catch a lot of really nice browns in the lower reaches, but after they started fingerling stocking the Branch a lot more and those fish started to find the Savage I stopped catching the number of browns I used to in the lower sections. Maryland DNR disagrees with me that the bows started pushing the browns upstream but until they shock that section I'll never be proven right. They always take their data from the upper half of the river.
