You can still catch cap coho in low water as long as the water is not too far below 2 on the gauge and there is no native weir built under the green bridge near the mouth. Some fish will still move in even if the river is low. The key is to fish the incoming tide. Doesn't seem to matter what time of day it is or how bright out it is. I've limited out easily on warm sunny afternoons in gin clear lowish water. These incoming fish are fresh from the ocean and will literally chase down your roe when you retrieve it. Remember that coho will still travel up the river even if it is a trickle. When they hit the cable pool they tend to slow down and develop lock jaw. This is where they get their "don't bite" reputation. I normally stay away from the cable pool. Any roe will work but of course the fresher the better (i.e. if your friend has freshly cured roe and you have freezer burnt dried crap, guess who will catch most of the fish?). If you cannot time the tides right, you could fish at first light in any of the deeper pools in the canyon or lower river. There will always be some stragglers from the incoming night tides. Blades and roe will work well. Over time you will find that some spots fish better at certain water levels. Keep in mind that these fish are not big and when the river runs fast and high, they prefer to take the easy paths up the river i.e. the edges. The best fishing comes after the first heavy rain from a long dry spell and they let water out of the dam. All the fish that have been blocked at the mouth by the native weir will be able to get through and you will experience some of the best fishing you will ever have.