Background: Alcohol use disorder (AUD) is a costly public health concern; yet, many individuals with AUD never receive formal treatment. Prior studies have identified that "hitting bottom" may be an important factor in seeking treatment for AUD) and the notion that "hitting bottom" is necessary for recovery is commonly portrayed in the popular media. Yet, "hitting bottom" has never been formally operationalized.

Objectives: The present article aimed to operationalize "hitting bottom."

Methods: A multiphase process was used to develop a measure of hitting bottom among individuals experiencing alcohol problems: The Noteworthy Aspects of Drinking Important to Recovery (NADIR). Psychometric evaluation of the measure was conducted using online data collected from individuals who identified as moderate to heavy drinkers (N = 597).

Results: The NADIR included five lower-order dimensions and one higher-order dimension ("hitting bottom"), had strong concurrent validity with measures of alcohol use severity and alcohol-related problems, and was found to have excellent internal consistency reliability (α > 0.90). An overall summary score on the NADIR of 50+ (factor scores>0) differentiated individuals who had previously sought treatment for AUD and reported more excessive alcohol use compared to those with no treatment history and lower levels of alcohol use. Thus, the NADIR with a cutoff of 50 may be a good starting point for future researchers to test as a method to identify individuals who have hit bottom. Conclusions/Importance: The NADIR provides a viable operational definition of hitting bottom. Future research should evaluate the predictive validity of the NADIR.