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Harbor Survey Observations at Milwaukee 1871-Monthly means

[Data Table].

Datum plain supposed to be 0.75 below city zero.-

Stage of water May 17th-20th 1875 1.00 1.10 & 1.20A being about the average for many years.
The monthly averages for the past 20 years has varied from

[Measurements]

Pump at Water works has now 8 feet water

When lowest/highest it will have [Estimates...]