U.S. Army Corps of Engineers - Little Rock District Pertinent Data File for the 2017 Low Dissolved Oxygen (DO) Season --------------------------------------------- 16May - TR.DO and SC.OF.OZ sensors installed. 17May - Norfork penstock and tailwater D.O./temp gages installed. 18May - Bull Shoals penstock and tailwater D.O./temp gages installed. 31May - TR.DO gage visit by USGS, temp gage repaired and D.O. calibration checked. 01Jun - All gages are all installed, Norfork gages need low water to complete and correct communication issues between gages. 09Jun - problems remain at a couple D.O. sensors. Norfork high water has created an unsafe access problem, the gage was finally installed and is reading high and awaits calibration. Beaver TW D.O. sensor is reading low during no generation. 13Jun - Table Rock drops under 6 ppm during generation, vents blocked open. 15Jun - Norfork appears to be under 5 ppm, block open vents. NORTW gage is now working. BEA.DO is only gage suspected to be needing adjustments. 13-16 June - First lake profiles of the season, lower than last year: Beaver 14 Jun 17 6.17 vs 7.47 13 Jun 16 Table Rock 16 Jun 17 4.57 vs 6.67 16 Jun 16 Bull Shoals 15 Jun 17 6.47 vs 8.53 14 Jun 16 Norfork 14 Jun 17 4.45 vs 5.18 15 Jun 16 Greers Ferry 13 Jun 17 6.53 vs 7.74 14 Jun 16 26Jun - USGS reports BEA.DO gage is reporting parameters in reverse order, temp is D.O. and vice versa. 26Jun - IDO plots are updated and June readings are historically low when compared to the data set that starts in 1985. Data is sent to the D.O. committee members via email. 28Jun - Table Rock received 2 loads of liquid oxygen. 29Jun - Beaver vents blocked open. 05Jul - USGS has scheduled next profiles for the week of 17 July. These will be for Table Rock, Bull Shoals, and Norfork only. 18Jul - Beaver IDO=5.24; Table Rock IDO=3.08; Bull Shoals IDO=5.88. 19Jul - Norfork IDO=2.97 24Jul - Greers Ferry tailwater D.O. drops below 6 ppm over previous weekend. Sent word to dam to block open vents. Previous earliest opening of vents was 01 Aug 2011. 31Jul - Bull Shoals vents blocked open. 01Aug - Norfork tailwater D.O. dropped below 4 ppm; Shiphon operated 24/7 to improve conditions. A recommended maximum generation rate of 100% was issued at Table Rock and Norfork Lake. 09Aug - Norfork recommended maximum generation rate of 90% nameplate or 36 MW per unit was issued. 11Aug - Table Rock recommended maximum generation rate of 88% nameplate or 44 MW per unit was issued. 15Aug - USGS checked TR.DO and SC.OF.OZ gages today. 15-17 Aug - Norfork, Bull Shoals, and Table Rock profiles measured: Norfork 15 Aug 2017 1.28 vs 1.70 09 Aug 2016 Bull Shoals 15 Aug 2017 3.72 vs 5.52 09 Aug 2016 Table Rock 17 Aug 2017 1.45 vs 3.82 08 Aug 2016 16Aug - Norfork recommended maximum generation rate of 75% nameplate or 30 MW per unit was issued. 16Aug - Table Rock is injecting LOX, RMG rate is 38 Mw per unit without injection or 76% nameplate. 16Aug - Table Rock injects 3.1 tons LOX. 17Aug - Table Rock injects 7.2 tons LOX. 17Aug - Fairview D.O./Temp gage below Bull Shoals started reporting erroneous data. Has been repaired. 25Aug - Norfork RMG rate is 70% nameplate (28 Mw per unit). 28-29 Aug - Table Rock, Norfork, and Greers Ferry profiles measured: Greers Ferry 28 Aug 2017 2.61 vs 4.98 12 Sep 2016 Norfork 28 Aug 2017 0.41 vs 0.41 12 Sep 2016 Table Rock 29 Aug 2017 1.04 vs 1.60 14 Sep 2016 29Aug - Table Rock recommended maximum generation rate of 70% nameplate or 35 MW per unit was issued. Table Rock injected 4.4 tons of LOX overnight. 30Aug - Norfork RMG rate is 60% nameplate (24 Mw per unit). 30Aug - Norfork RMG rate is 50% nameplate (20 Mw per unit). 30Aug - Table Rock injects 0.9 tons of LOX. 31Aug - Table Rock injects 13 tons LOX, Inventory 47 tons. Norfork tailwater gages stop reporting at midnight. Norfork generating 50 Mw, 20MW unit 1 and 30 from unit 2. 01Sep - Norfork tailwater gages report at 0700, possible battery issue and hoping gages will report during sunlight hours. 05Sep - Table Rock RMG rate changed to 60% (30Mw). 07Sep - Norfork generating 49 Mw, 20Mw unit 1 and 29 Mw unit 2. 11Sep - Norfork generating 48 Mw, 20Mw unit 1 and 28 Mw unit 2. 11Sep - Table Rock injected 4.3 tons of LOX. 12Sep - Norfork generating 45 Mw, 20Mw unit 1 and 28 Mw unit 2. 12Sep - Bull Shoals recommended maximum generation rate of 80% or 268 Mw was issued. 12Sep - Table Rock injected 9.9 tons of LOX. 13Sep - Table Rock injected 1.7 tons of LOX, 52.3 tons on hand. 14Sep - Bull Shoals recommended maximum generation rate of 80% or 264 Mw was issued. 14Sep - Table Rock injected 5.2 tons of LOX, 47.1 tons on hand. 15Sep - Table Rock injected 3.4 tons of LOX, 17.1 tons delivered. 60.9 tons LOX on hand. 16Sep - Table Rock injected 2 tons of LOX, 58.9 tons on hand. 18Sep - Table Rock injected 4.9 tons of LOX, 54 tons on hand. 20Sep - Bull Shoals RMG rate is 75% of 195 Mw.