It all depends on the weather (rain, etc.) as it will dictate water temps. There is some good fishing under the 45 degrees that Andy had mentioned.
Are you planning to jig or handlining?
The first two weeks of April is pretty good for the jig bite if you are looking for a wallhanger.
The surface temps are still on the cold side causing the fish to be rather lethargic. If you can maintain good control of your boat and river conditions permit downsize to a 3/8 ounce jig tipped with a Minnow to give those letharic fish an easy meal.
I have close to 5 years of reports on my personal website and here are the water temps from various spring dates the last few years:
April 5, 2006: 40-42 deg.
March 31, 2006: 37-38 deg.
April 12, 2005: 42-44 deg.
March 31, 2005: 36 deg.
March 30, 2005: 35-36 deg.
March 13,2005: 37 deg.
May 10, 2004: 54 deg.
April 16, 2004: 44.5 deg
April 9, 2004: 42 deg.
May 1, 2003: 51-53 deg.
March 26, 2003: 38 deg
March 16, 2003: 34-36 deg.
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