More on Crooked as Crawley from Infoplease:

• Crooked as Crawley - Crooked as Crawley (See Crawley.) Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 ...
• Crawley - Crawley Crooked as Crawley (or) Crawley brook, a river in Bedfordshire. That part called the brook, ...
• Dictionary of Phrase and Fable: C - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "C"