U.S. Army Corps of Engineers - Little Rock District
Pertinent Data File
for the 2016 Low Dissolved Oxygen (DO) Season
---------------------------------------------
13 Apr - USGS provided a profile of Beaver Lake measured for the
Beaver Water District. IDO is 9.22, surface temp is 55.9 F and
46.6 F at max depth
04 May - BEA.DO D.O and Temperature gage starts operating.
05 May - INNOR.DO, INBUL.DO-4, and INBUL.DO-5 D.O. and Temperature
gages start operating.
31 May - All D.O./temp gages are operational.
17 Jun - The week ending 17 June, USGS to measure profiles for
all 5 lakes.
10 Jun - Norfork tailwater D.O. has dropped below 6 ppm. USGS will
be there next week to measure lake temp/DO profile and check
tailwater gages.
13 Jun - Norfork vent covers have been blocked open. Both
tailwater gages are tracking in a similar manner. This should not
be a calibration issue. Earliest this has happened was 7 June 2012.
Beaver DO has dropped to 6 ppm during generation. USGS will
check gage this week and if verified the vents at Beaver will
be blocked open.
13 Jun - Beaver Lake profile indicates warmer temperatures and lower
DO than last year in June.
14 Jun - USGS has checked the Beaver DO gage and made some changes to
the intake. Readings appear to have improved.
13 Jun - Beaver Lake profile taken, I.D.O. = 7.57 vs. 9.03 in 2015
14 Jun - Greers Ferry profile taken, I.D.O. = 7.74 vs. 9.37 in 2015
14 Jun - Bull Shoals profile taken, I.D.O. = 8.53 vs. 10.01 in 2015
15 Jun - Norfork profile taken, I.D.O. = 5.18 vs. 8.06 in 2015
16 Jun - Greers Ferry profile taken, I.D.O. = 6.67 vs. 9.37 in 2015
Bvr, TR, & BS are tracking in the middle of historic IDO bands.
Nrf is near the historic low for June and GF is in lower third.
07 Jul - Table Rock D.O. has dropped below 6 ppm during heavy
generation. Vacuum breaker vents have been blocked open.
Were blocked open on 06 July 2015.
09 Jul - BUL.DO gage stopped sending data.
11 Jul - BUL.DO gage back in business.
12 Jul - Beaver D.O. has dropped below 6 ppm during heavy
generation. Vent covers have been blocked open.
15 Jul - BUL.DO gage adjusted by USGS, was reading low.
11 Jul - Bull Shoals profile taken, I.D.O. = 7.10 vs. 8.82 July 2015
12 Jul - Table Rock profile taken, I.D.O. = 5.83 vs. 4.73 July 2015
12 Jul - Beaver profile taken, I.D.O. = 6.49 vs. 6.41 July 2012
13 Jul - Norfork profile taken, I.D.O. = 3.09 vs. 6.59 July 2015
14 Jul - Greers Ferry profile taken, I.D.O. = 7.04 vs 6.94 July 2012
19 Jul - Mo. USGS has serviced Table Rock and School of Ozarks gages.
20 Jul - BUL.DO gage dips unusually low as generation is ending.
Gage will be watched for trend. Left bank gage does not reflect
this lower D.O.
28 Jul - Average tailwater D.O. below Norfork Dam has dropped below
4 ppm during full power generation. The first recommended maximum
generation rate is 95% of nameplate capacity, 38MW per unit.
01 Aug - BEA.DO gage exhibits strange dips in D.O. levels during
periods of non-generation that were not reflected in the previous
lake profile.
08 Aug - Average tailwater D.O. below Norfork Dam has dropped below
4 ppm during 95% nameplate generation. The recommended maximum
generation rate is now 90% of nameplate capacity, 36MW per unit.
08 Aug - Missouri USGS checked Table Rock D.O./Temp gage and School
of the Ozarks D.O./Temp gage. School D.O. gage was adjusted.
11 Aug - Average tailwater D.O. below Norfork Dam has dropped below
4 ppm during 90% nameplate generation. The recommended maximum
generation rate is now 85% of nameplate capacity, 34MW per unit.
09 Aug - Bull Shoals profile taken, I.D.O. = 5.52 vs. 6.32 Aug 2015
08 Aug - Table Rock profile taken, I.D.O. = 3.82 vs. 3.33 Aug 2015
11 Aug - Beaver profile taken, I.D.O. = 5.01
09 Aug - Norfork profile taken, I.D.O. = 1.70 vs. 4.92 Aug 2015
11 Aug - Greers Ferry profile taken, I.D.O. = 6.02
23 Aug - Average tailwater D.O. below Norfork Dam has dropped below
4 ppm during 85% nameplate generation. The recommended maximum
generation rate is now 80% of nameplate capacity, 32MW per unit.
25 Aug - Bull Shoals D.O. has dropped below 6 ppm during heavy
generation. Vacuum breaker vents have been blocked open.
Last year were blocked open on 03 Sept 2015.
30 Aug - Average tailwater D.O. below Norfork Dam has dropped below
4 ppm during 80% nameplate generation. The recommended maximum
generation rate is now 75% of nameplate capacity, 30MW per unit.
31 Aug - Average tailwater D.O. below Norfork Dam has dropped below
4 ppm during 75% nameplate generation. The recommended maximum
generation rate is now 67% of nameplate capacity, 27MW per unit.
08 Sep - Average tailwater D.O. below Norfork Dam has dropped below
4 ppm during 67.5% nameplate generation. The recommended maximum
generation rate is now 65% of nameplate capacity, 26MW per unit.
08 Sep - Tailwater D.O. below Table Rock Dam has dropped below
4 ppm during 200 Mw generation. The recommended maximum
generation rate is now 85% of nameplate capacity, 42MW per unit.
without LOX injection. Inventory this morning was 41 tons. Use
for the day was 4.6 tons over 3 hours.
09 Sep - Average tailwater D.O. below Norfork Dam has dropped below
4 ppm during 65% nameplate generation. The recommended maximum
generation rate is now 60% of nameplate capacity, 24MW per unit.
12 Sep - Greers Ferry vents blocked open. Table Rock LOX
inventory 34.6 tons.
12 Sep - Greers Ferry profile taken, I.D.O. = 4.98.
12 Sep - Norfork profile taken, I.D.O. = 0.41 vs. 1.58 Sep 2015.
13 Sep - Bull Shoals profile taken, I.D.O. = 3.87 vs. 4.64 Sep 2015.
14 Sep - Table Rock profile taken, I.D.O. = 1.60 vs. 0.99 Sep 2015
14 Sep - Beaver profile taken, I.D.O. = 4.40.
20 Sep - Average tailwater D.O. below Norfork Dam has dropped below
4 ppm during 60% nameplate generation. The recommended maximum
generation rate is now 55% of nameplate capacity, 22MW per unit.
20 Sep - RMG rate at Norfork lowered to 50% nameplate to get out of
rough zone.
22 Sep - RMG rate at Table Rock is now 76% nameplate, or 38 Mw per
unit. Current LOX inventory is 36.1 tons.
21 Sep - 4.5 tons LOX injected at Table Rock.
22 Sep - 8.3 tons LOX injected at Table Rock, inventory 27.1 tons.
28 Sep - 20.8 tons LOX delivered to Table Rock, total 47.9 tons.
03 Oct - 1.1 tons LOX injected at Table Rock, inventory 46.8 tons.
05 Oct - RMG rate at Table Rock is now 70% nameplate, or 35 Mw per
unit without LOX injection. 21.9 tons LOX injected this day.
06 Oct - 21.9 tons LOX injected at Table Rock, inventory 24.9 tons.
04 Oct - Norfork profile taken, I.D.O. = 0.00 vs 0.37 20 Oct 2015
04 Oct - Greers Ferry profile taken, I.D.O. = 3.93
05 Oct - Bull Shoals profile taken, I.D.O. = 1.81 vs 2.70 21 Oct 2015
05 Oct - Beaver profile taken, I.D.O. = 3.56
06 Oct - Table Rock profile taken, I.D.O. = 0.81 vs 0.00 22 Oct 2015
17 Oct - At Table Rock, 1.9 tons LOX injected. Present inventory
22.6 tons.
17 Oct - USGS checked Table Rock and School of the Ozarks temp and
D.O. gages
18 Oct - RMG rate at Table Rock is 64% nameplate, 32 Mw per unit.
18 Oct - RMG rate at Bull Shoals is 88% nameplate, 35 MW units
1-4 and 39 Mw units 5-8.
18 Oct - SWPA advises that near record tempertures may create a
need to exceed RMG rate at Bull Shoals. No problems with
generation rates or tailwater D.O.
18 Oct - Table Rock received 16 tons LOX and injects 4.8 tons.
End of day inventory is 33.8 tons.
19 Oct - Table Rock Lox injection, 9.5 tons used today.
21 Oct - Table Rock LOX morning inventory 24.3 tons. There was a
delivery of 16.7 tons, inventory is 43 tons.