L&D21 6am Report THURSDAY 11 JUN 2026
LockMaster: Jeffrey (Jeff) Gibbs Flat Pool = 12.2 Flat Tail = 1.7 River Mile = 324.9
Asst: Dallas Roberts DA = 135,000 mi^2 UNG LOC DA = ??? mi^2 %UNG LOC = ?%
Phone: (217) 222-0918 or (6222) Flood Stage = 17 Lock Closed = 21.4 Top of Lock = 25.7
10 Submrg Tainters (60') Gates #1-5, 9-13 LD20(2 hr) <- LD21 -> LD22(2 hr) Top of Spillway = 12.7
3 Submrg Rollers (100') Gates #6,7,8 Out of Operation = 11.0' = 133,000 cfs Swell Head = 0.7
Max Submrg Setting = -79.0 X -21.0 = 88,400 cfs Gage Zero = 457.80 TW cntrl > 7.0' GATE cntrl < 6.4'
6am Maximum Permissible Feet of Bulkhead = 0 Record Flood Stage = 31.30 in July 1993
M I 2 1 Q L D I 2
Float Gage Wind Temp
Pool Tail Tnt Rlr Flow T Q/f R Q/f Pool Tail Pool Tail Spd Dir Gst Air Water Prec UINI2
0000: 12.75 7.56 66.0 22.0 91.7 0.00 0.00 12.72 7.54 12.73 7.59 1 SE 3 78 78 0.00 12.19
0100: 12.79 7.56 66.0 22.0 91.7 0.00 0.00 12.74 7.57 12.74 7.62 1 SE 2 77 78 0.00 12.23
0200: 12.83 7.56 66.0 22.0 91.7 0.00 0.00 12.81 7.56 12.82 7.60 1 S 3 78 78 0.00 12.24
0300: 12.86 7.58 66.0 22.0 92.0 0.00 0.00 12.84 7.55 12.85 7.60 1 SE 2 78 78 0.00 12.29
0400: 12.89 7.60 66.0 22.0 92.2 0.00 0.00 12.88 7.46 12.89 7.50 0 S 1 78 78 0.00 12.31
0500: 12.92 7.63 66.0 22.0 92.5 0.00 0.00 12.91 7.59 12.92 7.63 1 S 3 77 78 0.00 12.25
0600: 12.95 7.65 66.0 22.0 92.8 0.00 0.00 12.94 7.63 12.95 7.68 1 SE 2 77 78 0.00 0.00 12.39
0700: 12.99 7.68 66.0 22.0 93.1 0.00 0.00 12.95 7.64 12.96 7.69 3 S 5 79 78 0.00 12.39
0800: 13.02 7.70 72.0 24.0 93.4 0.00 0.00 13.01 7.66 13.03 7.70 3 S 11 82 78 0.00 12.46
0900: 12.85 7.87 72.0 24.0 95.4 0.00 0.00 12.77 7.95 12.77 7.99 7 SW 14 83 78 0.00 12.21
1000: 12.68 8.04 72.0 24.0 97.5 0.00 0.00 12.69 8.01 12.70 8.05 9 S 17 85 78 0.00 12.08
1100: 12.62 8.05 72.0 24.0 97.6 0.00 0.00 12.62 8.08 12.63 8.11 9 SW 14 86 78 0.00 12.05
1200: 12.55 8.06 72.0 24.0 97.7 0.00 0.00 12.59 8.06 12.60 8.09 12 SW 19 84 78 0.00 0.00 12.00
1300: 12.66 8.20 72.0 24.0 99.3 0.00 0.00 12.71 8.09 12.73 8.14 8 W 12 73 78 0.00 12.15
1400: 12.77 8.33 80.0 26.0 100.9 0.00 0.00 12.77 8.33 12.78 8.38 7 SW 13 71 78 0.37 12.35
1500: 12.59 8.54 80.0 26.0 103.4 0.00 0.00 12.46 8.66 12.46 8.69 1 E 3 71 78 0.23 12.05
1600: 12.41 8.75 80.0 26.0 105.9 0.00 0.00 12.41 8.75 12.43 8.80 4 SE 9 74 78 0.04 11.97
1700: 12.38 8.77 80.0 26.0 106.2 0.00 0.00 12.39 8.79 12.41 8.84 1 SE 5 75 78 0.00 11.94
1800: 12.34 8.79 80.0 26.0 106.4 0.00 0.00 12.34 8.78 12.36 8.82 2 SE 5 80 78 0.00 0.64 11.89
1900: 12.32 8.79 80.0 26.0 106.3 0.00 0.00 12.36 8.78 12.37 8.82 2 SE 5 78 78 0.00 11.91
2000: 12.30 8.78 80.0 26.0 106.3 0.00 0.00 12.30 8.79 12.31 8.83 1 SE 3 79 78 0.00 11.85
2100: 12.43 8.81 80.0 26.0 106.7 0.00 0.00 12.34 8.80 12.36 8.85 2 NE 6 78 78 0.00 11.89
2200: 12.55 8.85 80.0 26.0 107.1 0.00 0.00 12.58 8.83 12.59 8.87 18 NW 33 68 78 0.21 12.01
2300: 12.77 8.99 80.0 26.0 108.8 0.00 0.00 12.68 8.97 12.69 9.01 9 N 11 70 77 0.56 12.21
2400: 12.98 9.14 80.0 26.0 110.6 0.00 0.00 12.97 9.11 12.98 9.16 14 NW 17 70 77 0.34 1.11 12.43
0100: 12.98 9.65 80.0 26.0 116.6 0.00 0.00 12.82 9.73 12.84 9.77 5 S 9 70 76 0.70 12.46
0200: 12.98 10.16 88.0 30.0 122.6 0.00 0.00 12.98 10.16 13.00 10.19 2 S 4 69 76 0.17 12.56
0300: 13.30 10.52 88.0 30.0 126.8 0.00 0.00 13.28 10.54 13.30 10.56 4 SE 8 69 76 0.02 12.87
0400: 13.62 10.87 88.0 30.0 131.0 0.00 0.00 13.60 10.86 13.61 10.88 5 SE 9 68 76 0.00 13.18
0500: 13.55 11.51 88.0 30.0 138.5 0.00 0.00 13.93 11.18 13.94 11.20 3 SE 5 68 76 0.00 13.48
0600: 13.48 12.15 150.0 45.0 146.1 0.00 0.00 13.55 12.11 13.54 12.13 3 SE 9 68 76 0.00 0.89 13.48
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2.64
HG QR Chg Prec
MBRI2 13.98 8214 8061 ______ Ystday Avg LD21 Q: 99.2 Chg: 4.3
CNZM7(18) 19.51 5050 5015 1.52 Ystday Avg LD20 Q: 100.5 Chg: 7.0
UNGAGED _____ _____ Ystday Avg Trib Q: 0.3 Chg: -0.1
_____ ____ Ystday Avg Stor Q: 0.0
Total 13264 13075
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SPREAD -1.6
OMNI -- 6hr Change = 0.50 24hr Equivl = 2.00 Storage/FT Change = 0 6HR DELTA Pool = 0
FLOAT-- 6hr Change = 0.58 24hr Equivl = 2.32 Storage/FT Change = 0 6HR DELTA Pool = 0
P.T. -- 6hr Change = 0.56 24hr Equivl = 2.24 Storage/FT Change = 0 6HR DELTA Pool = 0
OMNI -- 8hr Change = 0.93 24hr Equivl = 2.79 Storage/FT Change = 0 8HR DELTA Pool = 0
FLOAT-- 8hr Change = 0.97 24hr Equivl = 2.91 Storage/FT Change = 0 8HR DELTA Pool = 0
P.T. -- 8hr Change = 0.95 24hr Equivl = 2.85 Storage/FT Change = 0 8HR DELTA Pool = 0
OMNI -- 12hr Change = 1.14 24hr Equivl = 2.28 Storage/FT Change = 0 12HR DELTA Pool = 0
FLOAT-- 12hr Change = 1.21 24hr Equivl = 2.42 Storage/FT Change = 0 12HR DELTA Pool = 0
P.T. -- 12hr Change = 1.18 24hr Equivl = 2.36 Storage/FT Change = 0 12HR DELTA Pool = 0
Balanced Gates Jacob Charts Rating Table
10.0 x 3.0 (6.2) 76.0 --> 52 x 17 (11.0)132500
12.5 x 4.5 (6.4) 78.0 --> 54 x 17 (12.0)144200
17.0 x 6.0 (6.6) 81.0 --> 58 x 17 (13.0)157000
21.5 x 7.5 (6.8) 83.0 --> 59 x 18 (14.0)171000
24.5 x 8.5 (7.0) 85.0 --> 60 x 19 (15.0)184500
26.0 x 9.0 (7.2) 87.5 --> 64 x 20 (16.0)201000
30.0 x 10.0 (7.4) 90.0 --> 65 x 21 (17.0)217700
31.0 x 10.5 (7.6) 92.0 --> 66 x 22 (18.0)235400
34.5 x 11.5 (7.8) 94.2 --> 67 x 24 <-- Appendage (19.0)254000
36.5 x 12.0 (8.0) 96.4 --> 72 x 24 <-- 24-27 (20.0)272000
39.5 x 13.5 (8.2) 98.5 --> 76 x 24 <-- Significant (21.0)289000
45.5 x 15.0 (8.4) 100.7 --> 78 x 25 <-- change in (22.0)304000
50.0 x 16.5 (8.6) 102.7 --> 80 x 27 <-- flow will (23.0)318000
55.0 x 17.5 (8.8) 104.8 --> 83 x 27 <-- occur (24.0)337000
60.0 x 19.0 (9.0) 106.9 --> 86 x 27 <-- (25.0)358000
65.0 x 21.0 (9.2) 108.9 --> 86 x 30 (26.0)379000
68.0 x 22.0 (9.4) 111.0 --> 90 x 30 (27.0)400000
70.0 x 24.0 (9.6) 113.0 --> 94 x 30 (28.0)427000
78.0 x 25.0 (9.8) 115.0 --> 98 x 30 (29.0)458500
81.0 x 27.0 (10.0) 117.1 --> 100 x 33 (30.0)491000
88.0 x 30.0 (10.2) 119.1 --> 110 x 33 (31.0)529000
96.0 x 33.0 (10.4) 121.2 --> 120 x 36 (32.0)579900
105.0 x 35.0 (10.6) 123.2 --> 130 x 39 (33.0)672000
(10.8) 125.3 --> 140 x 42
(11.0) 127.5 --> 150 x 45