(1) For certain lakes and reservoirs, waterbody-specific criteria are appropriate to enhance nutrient management. The response to nutrient input may vary significantly lake-to-lake, and for a given lake year-to-year, depending on a number of factors such as rainfall distribution and hydraulic retention time. For this reason, lake nutrient quality targets necessary to maintain and protect existing uses, expressed as chlorophyll a criteria, may also vary lake-to-lake. Because the relationship between nutrient input and lake chlorophyll a levels is not always well-understood, it may be necessary to revise the criteria as additional water quality data and improved assessment tools become available.
(2) The following lake-specific criteria apply to the waters listed below, in addition to any other applicable criteria commensurate with the designation usage of such waters.
(a) The Alabama River Basin
1. Claiborne Lake: those waters impounded by
Claiborne Lock and Dam on the Alabama River. The lake has a surface area of
5,930 acres at full pool. (i) Chlorophyll
a (corrected, as described in Standard
Methods for the Examination of Water and Wastewater,. 20th
Edition, 1998): the mean of the photic-zone composite
chlorophyll a samples collected monthly April through October
shall not exceed 15 µg/1, as measured at the deepest point, main river channel
dam forebay.
2. Dannelly
Lake: those waters impounded by Millers Ferry Lock and Dam on the Alabama
River. The lake has a surface area of 17,200 acres at full pool
(i) Chlorophyll a
(corrected, as described in Standard
Methods for the
Examination of Water and Wastewater, 20th
Edition, 1998): the mean of the photic-zone composite chlorophyll
a samples collected monthly April through October shall not
exceed 17 µg/1, as measured at the deepest point, main river channel, dam
forebay.
(b)
The Black Warrior River Basin 1. Warrior
Lake: those waters impounded by Warrior Lock and Dam on the Black Warrior
River. The lake has a surface area of 7,800 acres at full pool
(i) Chlorophyll a
(corrected, as described in Standard
Methods for the
Examination of Water and Wastewater, 20th
Edition, 1998): the mean of the photic-zone composite chlorophyll
a samples collected monthly April through October shall not
exceed 12 µg/1, as measured at the deepest point, main river channel, dam
forebay.
2. Oliver Lake
those waters impounded by William Bacon Oliver Lock and Dam on the Black
Warrior River. The lake has a surface area of 800 acres at full pool
(i) Chlorophyll a
(corrected, as described in Standard Methods for the Examination of
Water and Wastewater,. 20th Edition,
1998): the mean of the photic-zone composite chlorophyll a
samples collected monthly April through October shall not exceed 12 µg/1, as
measured at the deepest point, main river channel, dam forebay.
3. Holt Lake: those waters
impounded by Holt Lock and Dam on the Black Warrior River. The lake has a
surface area of 3,200 acres at full pool. (i)
Chlorophyll a (corrected, as described in Standard
Methods for the Examination of Water and Wastewater, 20th
Edition, 1998): the mean of the photic-zone composite
chlorophyll a samples collected monthly April through October
shall not exceed 16 µg/1, as measured at the deepest point, main river channel,
dam forebay.
4. Lake
Tuscaloosa: those waters impounded by Lake Tuscaloosa Dam on the North River.
The lake has a surface area of 5,885 acres at full pool.
(i) Chlorophyll a
(corrected, as described in Standard Methods for the Examination of
Water and Wastewater, 20th Edition, 1998):
the mean of the photic-zone composite chlorophyll a samples
collected monthly April through October shall not exceed 8 µg/1, as measured at
the deepest point, main river channel, dam forebay.
5. Bankhead Lake: those waters impounded by
John Hollis Bankhead Lock and Dam on the Black Warrior River. The lake has a
surface area of 9,200 acres at full pool. (i)
Chlorophyll a (corrected, as described in Standard
Methods for the Examination of Water and Wastewater, 20th
Edition, 1998): the mean of the photic-zone composite
chlorophyll a samples collected monthly April through October
shall not exceed 16 µg/1, as measured at the deepest point, main river channel,
dam forebay.
6. Smith
Lake: those waters impounded by Lewis M. Smith Dam on the Sipsey Fork River.
The lake has a surface area of 21,200 acres at full pool.
(i) Chlorophyll a
(corrected, as described in Standard Methods for the Examination of
Water and Wastewater, 20th Edition, 1998):
the mean of the photic-zone composite chlorophyll a samples
collected monthly April through October shall not exceed 5 µg/1, as measured at
the deepest point, main river channel, dam forebay; 5 µg/1, as measured at the
deepest point, main river channel, at Duncan Creek/Sipsey River confluence
(downstream of the Alabama Highway 257 bridge); and 5 µg/1, as measured at the
deepest point, main river channel, immediately downstream of Brushy Creek
confluence.
7. Inland
Lake: those waters impounded by Inland Lake Dam on the Blackburn Fork of the
Little Warrior River. The lake has a surface area of 1,095 acres at full pool.
(i) Chlorophyll a
(corrected, as described in Standard Methods for the Examination of
Water and Wastewater, 20th Edition, 1998):
the mean of the photic-zone composite chlorophyll a samples
collected monthly April through October shall not exceed 6 µg/1, as measured at
the deepest point, main river channel, dam forebay.
(c) The Cahaba River Basin
1. Lake Purdy: those waters impounded by Lake
Purdy Dam at the headwaters of the Cahaba River. The lake has a surface area of
1,050 acres at full pool. (i) Chlorophyll
a (corrected, as described in Standard
Methods for the Examination of Water and Wastewater,
20th Edition, 1998) : the mean of
photic-zone composite chlorophyll a samples collected monthly
April through October shall not exceed 16 µg/1, as measured at the deepest
point, main river channel, dam forebay; or 18 µg/1, as measured at the deepest
point, main river channel, immediately upstream of the Irondale
Bridge.
(d)
The Chattahoochee River Basin 1. Walter F
George Lake: those waters impounded by Walter F. George Lock and Dam on the
Chattahoochee River. The lake has a surface area of 45,181 acres at full power
pool, 18,672 acres of which are...
