UPDATE 11/3/07: It is a Northern Jacana! There are only three accepted Arizona records. According to some golfers, it has been here for a month or more. Today it was on the northwestern pond on the back nine.
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see some stunning photos here: http://www.azfo.org/gallery/noja.html
Access: it is suggested that any one going to look for the jacana check in at the pro shop first to ask permission/check in. They are aware of the bird and of the birders. Be prepared for a variety of reactions from golfers (stay out of their way), and beware of stray golf balls!
From I-10: exit 190 (McCartney Rd), travel west to Pinal Ave (387), south 2 miles, right on Korsten, west 1 mile, right on Thornton to clubhouse.
From I-8: exit 172 (Thornton), travel north about 5 miles to clubhouse.
From clubhouse to best viewing spot: south on Thornton to Korsten, left to Pinal Ave, north 1 mile to Rodeo. Left on Rodeo to end of pavement; park and walk south along west edge of golf course. Bird was along edges of first pond (northwesternmost).
Note that the Casa Grande Wastewater Treatment Plant located just west of the golf course. I have not been there but recall the occasional bird report.