First, I believe that latitude should read 38' rather than 33', which places the location as stated (33' being in Sentinel Meadow). I certainly know of no eruptive record for any of those springs along the river below the Madison Campground. There can be, I think, little doubt but that those springs are related to the Terrace Springs, just up the road to the north. Those springs are Yellowstone-cool, with temperatures only a little above 60 deg C (140 deg F), and in my experience (and I haven't been to these springs in many years) these by the campground are cooler still. The "eruption" visible at Terrace Spring itself is entirely (or almost entirely) due to the evolution of carbon dioxide. With that, if there was any sort of eruption from the spring near the campground, then I'd bet it was from CO2. But as I said, I've never heard of such a thing. Scott Bryan In a message dated 1/26/2009 7:47:12 P.M. US Mountain Standard Time, bpnjensen at yahoo.com writes: He gave the coordinates as: Coordinates: 44^ 33'31.18"N and 110^52'23.17"W This spot is readily visible as a creamy colored spot on Google Earth, very near where the road first comes close to the river west of the campground. Does anybody else know of possible play from this, or any other hot spring, along the Madison River? **************A Good Credit Score is 700 or Above. See yours in just 2 easy steps! (http://pr.atwola.com/promoclk/100000075x1215855013x1201028747/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=62%26bcd=De cemailfooterNO62) -------------- next part -------------- An HTML attachment was scrubbed... URL: </geyser-list/attachments/20090127/6fb443f2/attachment.html>