I need to find maps & charts showing CURRENT data regarding the major
sources of hydoroelectric energy in the US & the relative amount of
energy they provide.

A detailed, state by state accounting of hydroelectric energy
generation through the year 2002 is presented at the Department of
Energy site at:

http://www.eia.doe.gov/cneaf/electricity/epm/epmt11p1.html

More than 200 billion kilowatthours were generated by hydroelectric in
2002; the chart gives the amounts produced in each state, along with
the percent of the national total.

A note at the top of the page indicates an updated set of data is due
to posted sometime this month, so you might want to check back in a
week or two.

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Some beautiful maps, showing major hydroelectric energy sources, along
with all other major energy sources in the U.S., can be found at:

http://web.archive.org/web/20011030094859/www.eia.doe.gov/emeu/reps/states/maps/contents.html

The maps are arranged by Census Bureau Divisions; click on the area
you are interested in (New England, Pacific, etc) from the menu on the
left hand side of the page.

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I hope this is the information you need.  If not, please just post a
Request for Clarification and let me know how I can better assist you.