Since 1912, the stream gauge on Peachtree Creek has been located where it crosses Northside Drive just east of Interstate 75, just northwest of the Brookwood Split. It is located at, at above mean sea level. A rainfall puts approximately 1.5 billion gallons or almost 6 billion liters into the watershed, by USGS calculations. That watershed is. There is also water quality monitoring equipment there, all transmitted to GOES weather satellites and back down to the USGS in real time. Prior to this current system, daily flow and water quality sampling were done as far back as 1958 and 1959, respectively. Records for this site are maintained by the USGS Georgia Water Science Center. Flood stage is depth, and due to the heavy urbanization in the area, it often reaches above this mark during heavy storms. Peachtree Creek suffered massive flooding after Hurricane Frances and Hurricane Ivan in September 2004. Late on September 16, 2004, it reached a stage of, a flow of 14,200 cubic feet or 402 cubic meters per second, and a width of, its highest official flood record ever, which actually washed away its gauge. The creek was about ten times its normal width, three times its normal speed, and 300 times its normal flow. The worst flood ever occurred in 1919, when on January 29 or December 9 it reached a flow of about 21,000 cubic feet or 600 cubic meters per second, and a stage of. Another flood occurred in 1912 just above the 2004 event, and another in 1915 just below it. Base flow for the stream is about per second, and a depth of about. The 2009 Atlanta floods set new records for most streams in the area, and Peachtree Creek at Northside Drive came a close second place, reaching a height of on September 21, 2009 at 9:15 pm, and causing water to flow over the bridge. The North Fork reached a record of at 7:15pm, topping the previous record of in September 2004. The South Fork reached its third-highest ever at 5:45pm, the record being a flood that brought it to on March 16, 1976. The other stream gauges are SPJG1 on the South Fork "near Atlanta" at Johnson Road since April 2003, and NPBG1 also "near Atlanta" on the North Fork at Buford Highway since May 2003, with another on the North Fork further up "near Doraville" at Graves Road since June 2001.
On October 2017, future plans were released for the Peachtree Creek Greenway that will run along Peachtree Creek. Construction on the first section of the Greenway began in late 2018 in Brookhaven, GA. The goal of the greenway is to provide residents with close-to-home and close-to-work access to bicycle and pedestrian trails, serve transportation and recreation needs, and help encourage quality of life and sustainable economic growth. The trail will connect the cities of Atlanta, Brookhaven, Chamblee and Doraville.