L&D21 6am Report WEDNESDAY 18 FEB 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 = 185 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: 12.47 3.89 -45.0 -21.0 51.0 -0.63 -1.05 12.47 3.89 12.50 3.89 4 SE 6 50 34 0.00 11.80
0100: 12.46 3.88 -45.0 -21.0 50.9 -0.63 -1.05 12.47 3.87 12.50 3.87 4 SE 4 49 34 0.00 11.80
0200: 12.46 3.87 -45.0 -21.0 50.8 -0.63 -1.05 12.46 3.87 12.49 3.87 3 SE 4 48 34 0.00 11.78
0300: 12.46 3.87 -45.0 -21.0 50.8 -0.63 -1.05 12.46 3.89 12.48 3.88 2 SE 3 47 34 0.00 11.72
0400: 12.45 3.86 -45.0 -21.0 50.7 -0.63 -1.05 12.45 3.86 12.47 3.86 3 SE 4 49 34 0.00 11.76
0500: 12.43 3.88 -45.0 -21.0 50.5 -0.62 -1.05 12.43 3.91 12.46 3.90 4 SE 5 49 34 0.00 11.75
0600: 12.41 3.89 -45.0 -21.0 50.2 -0.62 -1.04 12.41 3.89 12.44 3.88 5 SE 8 49 34 0.00 0.00 11.69
0700: 12.41 3.87 -45.0 -21.0 50.3 -0.62 -1.04 12.40 3.88 12.43 3.87 4 SE 5 48 34 0.00 11.70
0800: 12.41 3.84 -45.0 -21.0 50.3 -0.62 -1.04 12.39 3.85 12.41 3.84 6 SE 9 48 34 0.00 11.67
0900: 12.41 3.83 -45.0 -21.0 50.3 -0.62 -1.04 12.38 3.85 12.41 3.84 5 SE 6 50 34 0.00 11.68
1000: 12.41 3.83 -45.0 -21.0 50.3 -0.62 -1.04 12.37 3.84 12.41 3.85 7 SE 10 51 34 0.00 11.67
1100: 12.41 3.85 -45.0 -21.0 50.3 -0.62 -1.04 12.38 3.86 12.41 3.85 9 SE 11 53 34 0.00 11.74
1200: 12.41 3.86 -45.0 -21.0 50.3 -0.62 -1.04 12.40 3.84 12.43 3.83 6 SE 8 54 34 0.00 0.00 11.74
1300: 12.41 3.86 -45.0 -21.0 50.4 -0.62 -1.04 12.40 3.85 12.43 3.86 10 SE 16 57 35 0.00 11.75
1400: 12.42 3.86 -45.0 -21.0 50.4 -0.62 -1.04 12.39 3.86 12.42 3.86 11 SE 15 57 35 0.00 11.75
1500: 12.40 3.85 -45.0 -21.0 50.2 -0.62 -1.04 12.38 3.89 12.41 3.88 10 SE 15 57 35 0.00 11.73
1600: 12.38 3.85 -45.0 -21.0 50.0 -0.61 -1.04 12.35 3.85 12.38 3.85 13 SE 18 56 35 0.00 11.64
1700: 12.38 3.83 -45.0 -21.0 50.0 -0.61 -1.04 12.37 3.84 12.40 3.84 8 SE 12 55 35 0.00 11.68
1800: 12.38 3.81 -45.0 -21.0 50.0 -0.61 -1.04 12.35 3.81 12.38 3.81 11 SE 17 54 35 0.00 0.00 11.67
1900: 12.37 3.83 -45.0 -21.0 49.8 -0.61 -1.04 12.31 3.81 12.34 3.80 8 SE 12 55 35 0.00 11.61
2000: 12.35 3.85 -45.0 -21.0 49.7 -0.61 -1.03 12.33 3.83 12.36 3.83 7 SE 11 54 35 0.00 11.61
2100: 12.35 3.83 -45.0 -21.0 49.7 -0.61 -1.03 12.35 3.87 12.38 3.86 8 S 11 56 35 0.00 11.61
2200: 12.35 3.80 -45.0 -21.0 49.7 -0.61 -1.03 12.35 3.85 12.38 3.85 7 SE 8 55 35 0.00 11.63
2300: 12.37 3.80 -45.0 -21.0 49.8 -0.61 -1.04 12.36 3.78 12.39 3.76 8 S 11 57 35 0.00 11.63
2400: 12.38 3.80 -45.0 -21.0 50.0 -0.61 -1.04 12.38 3.81 12.41 3.80 5 SE 6 57 35 0.00 0.00 11.66
0100: 12.38 3.81 -45.0 -21.0 50.0 -0.61 -1.04 12.39 3.82 12.42 3.81 5 S 7 57 35 0.00 11.68
0200: 12.38 3.81 -45.0 -21.0 50.0 -0.61 -1.04 12.40 3.79 12.43 3.78 4 S 5 56 35 0.00 11.67
0300: 12.38 3.80 -45.0 -21.0 49.9 -0.61 -1.04 12.39 3.80 12.42 3.79 6 S 9 58 35 0.00 11.68
0400: 12.37 3.79 -45.0 -21.0 49.9 -0.61 -1.04 12.37 3.77 12.40 3.76 11 SW 15 58 35 0.00 11.63
0500: 12.38 3.79 -45.0 -21.0 49.9 -0.61 -1.04 12.37 3.80 12.40 3.79 10 SW 15 58 35 0.00 11.63
0600: 12.38 3.78 -45.0 -21.0 50.0 -0.61 -1.04 12.36 3.75 12.39 3.76 12 SW 15 57 35 0.00 0.00 11.63
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0.00
HG QR Chg Prec
MBRI2 2.36 5 1 ______ Ystday Avg LD21 Q: 50.3 Chg: 0.1
CNZM7(18) 2.79 17 1 0.00 Ystday Avg LD20 Q: 48.2 Chg: 0.5
UNGAGED _____ _____ Ystday Avg Trib Q: 0.0 Chg: -0.0
_____ ____ Ystday Avg Stor Q: -0.0
Total 21 1
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SPREAD 2.0
OMNI -- 6hr Change = 0.00 24hr Equivl = 0.00 Storage/FT Change = 185 6HR DELTA Pool = 0
FLOAT-- 6hr Change = -0.02 24hr Equivl = -0.08 Storage/FT Change = 185 6HR DELTA Pool = -15
P.T. -- 6hr Change = -0.02 24hr Equivl = -0.08 Storage/FT Change = 185 6HR DELTA Pool = -15
OMNI -- 8hr Change = 0.03 24hr Equivl = 0.09 Storage/FT Change = 185 8HR DELTA Pool = 17
FLOAT-- 8hr Change = 0.01 24hr Equivl = 0.03 Storage/FT Change = 185 8HR DELTA Pool = 6
P.T. -- 8hr Change = 0.01 24hr Equivl = 0.03 Storage/FT Change = 185 8HR DELTA Pool = 6
OMNI -- 12hr Change = 0.00 24hr Equivl = 0.00 Storage/FT Change = 185 12HR DELTA Pool = 0
FLOAT-- 12hr Change = 0.01 24hr Equivl = 0.02 Storage/FT Change = 185 12HR DELTA Pool = 4
P.T. -- 12hr Change = 0.01 24hr Equivl = 0.02 Storage/FT Change = 185 12HR DELTA Pool = 4
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