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The fishing in the greater Sierra City area is quite good. We have around 45 lakes you can access both by car, OHV, and walking or hiking. Many of the lakes are stocked on a regular basis and give up nice fish daily. Stream fishing is quite good to.
Lakes: Sardine, Packer, Salmon, Snag, Haven and Gold Lakes are all accessible by vehicle. They are generally stocked off and on throughout the summer and will give up nice Rainbow and Brook Trout, and an occasional Brown trout. You can get boats by renting at Sardine lake and some times Packer and Salmon. There is boat access at Sardine, Salmon, Snag and Gold lakes. Folks have success fishing from the banks with lime green power bait and night crawlers, sometimes blown full of air so they will float. Panther Martin spinners, silver with orange in the body do well from the bank. One of my favorite techniques is trolling with a Dave Davis or Ford Fender flasher set and a worm about 18 inches behind on a leader. Troll very very slow so it is down deep and spinning very slow. If the wind is blowing the boat that is fast enough. Fly fishing is successful as well with the normal bank casting problems. Float tubes and boats are a good way to get to the areas where you find fish, usually where a stream comes in or if there is some structure near the edge. Look for rising activity early in the morning or as the sun sets. If you like to hike, Young America is great and is full of small Brook Trout that are the most colorful you will ever see. Tamarack Lake, Deer and Little Deer all have great fish and can be caught from the bank with spinners. A real treat is Deadman Lake off Highway 49. A steep one mile hike but you will catch Cut Throat trout from the bank. Lots of work but worth it.
Streams: the streams are all freestone in nature, running clear over rocks and such. In the spring the water is high and you must look for the eddies and calm spots. From late June on it calms down and can be rewarding. The North Fork of the Yuba River is the main river. It can be accessed all along Highway 49. The farther you go down the river to Downieville the larger the fish seem to get. I have found spinners thrown across the pools and brought in quickly have yielded nice fish. Worms on or in the "pillow", the upstream side of the rocks will give you some nice fish.
Fly Fishing: Well, fun and challenging. You can use wet flies (nymphs) such as Copper Johns or Hares Ear, a small split shot about 6 inches from the fly with success. Wooly Buggers are good for the Browns. Using a nymph below a dropper works well to, use a larger dry fly that can also double as a dry fly bait. I like to use dry flies and find anything with a hackle and wings that you can see is successful, around size 12-14. The next treat is the small tributaries that flow to the Yuba River. Salmon Creek, Packer Creek, Haypress Creek and others all provide great small stream action. I find walking upstream in the stream works well because of the heavy brush and willow growth. Look for the edges, shade and pillows to find browns, brookies and rainbow. Dry flies all day long in the shade will give you some action. Occasionally you will find a 12 inch fish, all native. Pauley Creek and upper Haypress are accessible with off road vehicles and are not fished often so they give up nice fish. Although fishing is good all summer it heats up in October. Warm days offer a fall hatch, the fish are moving to spawn and they are hungry. Sardine Creek out of Sardine Lake is great and will offer some great brook trout. The North Fork of the Yuba is open all year but outside the normal stream season it is artificial with no take. The rocks are covered with algae, I call them snot rocks, so wear wading shoes to keep traction and I suggest a good wading stick as well.