A. This is pretty tough to answer since I don't really know what you mean by "very" shallow and narrow. In general, it really depends on if there are any pools or deeper water where large fish can find cover and holding space. Narrow, shallow streams can hold some large fish if there are pools to provide these habitat characteristics. However, if the stream is essentially all shallow, you probably won't find many larger fish present.

I used to fish the Touchet River in southeastern Washington before I moved. It could certainly be called a shallow stream in that you can cross it about anyplace. But, there is a lot of nice holding water and pools large enough to hold browns up to 16" and adult steelhead. So, it gets back to what you mean by "very" shallow and narrow.