When the geographical surveyors came through the area in 1864, they noticed that one particular river ran into water which was so deep that no sand bar formed at the mouth. Because there was no "bar" that river was named "Temperance."
In 1864, when surveyors explored the area, they discovered a river that emptied into water too deep for a sandbar to form.  As a result, this river was named "Temperance."