So I wrote:
Bennett’s ad hoc relief policies were based on the premise that the depression was a temporary, seasonal phenomenon; he was confident that unemployment would soon return to its usual levels (Ulmer 2009; Struthers 1983). By the end of 1932, however, unemployment had risen to an unprecedented height.
By "height" I wanted to mean "level": a really high rate. But I am not sure if the word can be used this way. I don't want to use level again as I used it in the previous sentence.
Singular noun: When an activity, situation, or organization is at its height, it is at its most successful, powerful, or intense. All examples include "at".
Plural noun: If something reaches great heights, it becomes very extreme or intense.
the height of sth: the time when a situation or event is strongest or most full of activity.
Example: August is the height of the tourist season. At the height of the violence/crisis we were left without any help.