L&D21 6am Report FRIDAY 07 AUG 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 = 87 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: 12.38 5.97 49.0 17.0 77.6 1.11 1.36 12.29 6.12 12.32 6.12 1 NE 3 73 78 0.00 11.77
0100: 12.38 5.97 49.0 17.0 77.6 1.11 1.36 12.37 6.00 12.39 5.99 4 NE 6 73 78 0.00 11.75
0200: 12.37 5.97 49.0 17.0 77.5 1.11 1.36 12.36 5.99 12.37 5.98 2 E 3 72 78 0.00 11.75
0300: 12.35 5.98 49.0 17.0 77.4 1.11 1.36 12.35 6.05 12.37 6.04 2 S 4 72 78 0.00 11.74
0400: 12.33 5.99 49.0 17.0 77.2 1.11 1.35 12.34 5.96 12.35 5.96 3 E 5 72 78 0.00 11.71
0500: 12.31 5.99 49.0 17.0 77.1 1.10 1.35 12.32 5.95 12.33 5.95 3 SE 5 72 78 0.03 11.70
0600: 12.29 5.98 49.0 17.0 77.0 1.10 1.35 12.28 5.99 12.29 5.98 1 SE 3 71 77 0.05 0.08 11.68
0700: 12.24 5.97 49.0 17.0 77.0 1.10 1.35 12.27 6.02 12.28 6.01 2 SE 4 70 77 0.01 11.63
0800: 12.19 5.96 49.0 17.0 77.0 1.10 1.35 12.19 5.97 12.20 5.97 1 SE 2 69 77 0.00 11.54
0900: 12.17 5.95 49.0 17.0 76.7 1.10 1.34 12.15 5.92 12.16 5.92 1 SE 4 70 77 0.00 11.57
1000: 12.14 5.94 49.0 17.0 76.3 1.09 1.34 12.14 5.94 12.16 5.94 3 SE 8 70 77 0.01 11.53
1100: 12.14 5.82 49.0 17.0 72.8 1.10 1.35 12.10 5.86 12.11 5.87 1 S 2 74 77 0.00 11.45
1200: 12.14 5.70 44.0 15.0 69.4 1.11 1.36 12.14 5.69 12.16 5.69 2 S 3 75 77 0.00 0.02 11.47
1300: 12.06 5.60 44.0 15.0 69.5 1.11 1.36 12.08 5.58 12.10 5.58 2 S 5 78 77 0.00 11.43
1400: 11.98 5.50 44.0 15.0 69.6 1.12 1.37 11.93 5.52 11.94 5.51 2 SE 4 78 77 0.00 11.37
1500: 11.97 5.42 44.0 15.0 68.8 1.12 1.37 11.92 5.45 11.95 5.44 4 S 7 74 77 0.02 11.29
1600: 11.96 5.35 42.0 15.0 68.0 1.13 1.38 11.96 5.30 11.98 5.30 1 SE 4 77 77 0.00 11.31
1700: 11.96 5.25 42.0 15.0 68.4 1.13 1.39 11.96 5.24 11.97 5.23 1 S 2 77 77 0.00 11.31
1800: 11.95 5.16 42.0 15.0 68.9 1.14 1.40 11.93 5.14 11.96 5.15 1 S 3 78 77 0.00 0.02 11.25
1900: 11.94 5.17 42.0 15.0 68.8 1.14 1.40 11.97 5.17 11.99 5.16 0 S 2 77 77 0.00 11.29
2000: 11.92 5.17 42.0 15.0 68.7 1.14 1.40 11.92 5.17 11.93 5.15 1 S 2 75 77 0.00 11.27
2100: 11.92 5.15 42.0 15.0 68.8 1.14 1.40 11.91 5.13 11.92 5.13 0 SE 0 73 77 0.00 11.28
2200: 11.92 5.13 42.0 15.0 68.9 1.14 1.40 11.92 5.13 11.93 5.13 2 SE 4 72 77 0.00 11.28
2300: 11.93 5.11 42.0 15.0 68.4 1.14 1.40 11.91 5.12 11.94 5.12 3 SE 5 71 77 0.00 11.28
2400: 11.94 5.08 42.0 14.0 67.9 1.15 1.41 11.94 5.08 11.97 5.08 0 SE 1 69 77 0.00 0.00 11.31
0100: 11.94 5.08 42.0 14.0 67.9 1.15 1.41 11.93 5.04 11.94 5.04 2 SE 4 68 77 0.00 11.16
0200: 11.94 5.07 42.0 14.0 67.9 1.15 1.41 11.94 5.07 11.96 5.07 0 SE 0 68 77 0.00 11.29
0300: 11.95 5.06 42.0 14.0 68.0 1.15 1.41 11.96 5.04 11.98 5.05 0 SW 0 67 77 0.00 11.32
0400: 11.96 5.05 42.0 14.0 68.1 1.15 1.41 11.96 5.05 11.98 5.05 0 NE 1 67 77 0.00 11.31
0500: 11.96 5.04 42.0 14.0 68.2 1.15 1.41 11.95 5.02 11.97 5.03 1 SE 4 67 77 0.00 11.31
0600: 11.96 5.04 42.0 14.0 68.2 1.15 1.41 11.96 5.04 11.99 5.04 0 SE 1 66 77 0.00 0.00 11.30
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0.04
HG QR Chg Prec
MBRI2 3.00 59 -90 ______ Ystday Avg LD21 Q: 72.7 Chg: -3.9
CNZM7(18) 2.75 8 0 0.00 Ystday Avg LD20 Q: 69.9 Chg: -6.8
UNGAGED _____ _____ Ystday Avg Trib Q: 0.1 Chg: 0.1
_____ ____ Ystday Avg Stor Q: 0.0
Total 67 -90
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SPREAD 2.7
OMNI -- 6hr Change = 0.02 24hr Equivl = 0.08 Storage/FT Change = 88 6HR DELTA Pool = 7
FLOAT-- 6hr Change = 0.02 24hr Equivl = 0.08 Storage/FT Change = 88 6HR DELTA Pool = 7
P.T. -- 6hr Change = 0.02 24hr Equivl = 0.08 Storage/FT Change = 88 6HR DELTA Pool = 7
OMNI -- 8hr Change = 0.04 24hr Equivl = 0.12 Storage/FT Change = 88 8HR DELTA Pool = 11
FLOAT-- 8hr Change = 0.04 24hr Equivl = 0.12 Storage/FT Change = 88 8HR DELTA Pool = 11
P.T. -- 8hr Change = 0.06 24hr Equivl = 0.18 Storage/FT Change = 88 8HR DELTA Pool = 16
OMNI -- 12hr Change = 0.01 24hr Equivl = 0.02 Storage/FT Change = 88 12HR DELTA Pool = 2
FLOAT-- 12hr Change = 0.03 24hr Equivl = 0.06 Storage/FT Change = 88 12HR DELTA Pool = 5
P.T. -- 12hr Change = 0.03 24hr Equivl = 0.06 Storage/FT Change = 88 12HR DELTA Pool = 5
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