3 ms·

Current level: 10.52 ft. forecast has it at 7ft by end of October. Record lows: Low Water Records for Ohio River at Cairo (1) -1.00 ft on 12/24/1871 (2) 0.3

Current level: 10.52 ft. forecast has it at 7ft by end of October. Record lows: Low Water Records for Ohio River at Cairo (1) -1.00 ft on 12/24/1871 (2) 0.30 ft on 12/30/1876 (3) 1.10 ft on 01/01/1877 (4) 2.00 ft on 12/31/1887 (5) 2.50 ft on 10/20/1897 (6) 2.90 ft on 11/21/1901 (7) 4.93 ft on 07/12/1988 (8) 5.80 ft on 12/31/1963 (9) 6.87 ft on 08/28/2006 (10) 7.10 ft on 01/17/1981 (11) 7.15 ft on 08/29/2012 (12) 7.20 ft on 08/08/2005 (13) 8.52 ft on 09/11/2000 (14) 8.72 ft on 09/19/2005 (15) 8.72 ft on 07/25/2012 (16) 9.10 ft on 02/12/2000 (17) 11.33 ft on 06/30/2012 (18) 11.63 ft on 10/16/2006 (19) 13.10 ft on 05/19/2000 https://water.weather.gov/ahps2/water.php?wfo=pah&gage=ciri2 https://water.weather.gov/ahps2/water.php?wfo=pah&gage=ciri2

deathanatos 4y ago
Since I wondered how a river can have a negative depth: > A river's stage at a point (a gauge reading) is not an absolute measure of the depth of the water in the channel, rather it is a depth with respect to an historical Datum level. In summary, when a river gauge reads zero or in the negative numbers - it does not mean that the river has gone totally dry or is running below ground. It means that the gauge is reading at or below the agreed-upon zero level. > Silt may deposit in the river channel over time (filling the channel up), or the channel bottom may be scoured out to a deeper level by strong currents. > Still, the gauge zero datum levels are not changed to keep continuity. https://www.weather.gov/ctp/NegativeRiverStages https://www.weather.gov/ctp/NegativeRiverStages So, these aren't depth, and apparently aren't even comparable.
- avidphantasm 4y ago
  And depending on sediment transport dynamics for a particular reach of the river, the depth could be higher or lower at a given stage (i.e., height above datum) today than at the same stage in the past.

deathanatos 4y ago

Since I wondered how a river can have a negative depth: > A river's stage at a point (a gauge reading) is not an absolute measure of the depth of the water in the channel, rather it is a depth with respect to an historical Datum level. In summary, when a river gauge reads zero or in the negative numbers - it does not mean that the river has gone totally dry or is running below ground. It means that the gauge is reading at or below the agreed-upon zero level. > Silt may deposit in the river channel over time (filling the channel up), or the channel bottom may be scoured out to a deeper level by strong currents. > Still, the gauge zero datum levels are not changed to keep continuity. https://www.weather.gov/ctp/NegativeRiverStages https://www.weather.gov/ctp/NegativeRiverStages So, these aren't depth, and apparently aren't even comparable.

avidphantasm 4y ago
And depending on sediment transport dynamics for a particular reach of the river, the depth could be higher or lower at a given stage (i.e., height above datum) today than at the same stage in the past.