Broad Run

since the gauge here is unfortunately offline, I'll suggest a new one with some possible level correlations: GOOSE CREEK NEAR MIDDLEBURG, VA

Based on my experience, somewhere around 500cfs on that is about 0' on Broad, assuming rain isn't localized to like a 5 mile area around goose creek. 750cfs is about 1ft, 1000-1200cfs is about 2ft, and 1500+ is 3ft. So, as a general rule I'd say if it's 500cfs and not dropping fast, you'll should be able to run Broad, even in the summer. If it's 1000cfs, you'll definitely get a good flow. If it's 2000+ and not dropping, you'll get a nice big water flush.

The run as a whole reminds me of a creekier version of the Savage. From about 6' to 1.5ft it's a great III-III+ creek run. Over 2ft it's an easy class IV flush that's pretty hard to beat in the DC area. Over 3ft, it's in the trees and is a bit more serious, but, still really fun.