Originally Posted by TheKid
when do those runs usually end up getting to low to run? I wanted to make a trip somewhere christmas break.
Many of those runs are getting low around Christmas, and I've been skunked with the runs around there in the first week of January. The Salto is dam released, and usually has some water in it. But Micos can be almost too low to boat, and runs such as the Verde and the Santa Maria will be very low if not unboatable. The Ojo Frio is spring fed but usually not at boatable levels at Xmas- it needs some rain for it to come up. I've been to San Luis Potosi 6 times; twice at Thanksgiving and 4 times during Christmas. Flows were low two of those Xmas trips and OK the other two. We bailed entirely on SLP one of those trips and drove all the way to Veracruz, which adds anoth 2 days of just driving. Flows were much better at Thanksgiving (like the photos that Brian posted).
In other words, my recommendation is Thanksgiving if you can help it.
The Gringo's Guide by Roby is a good place to start, but there are some other beta that might some in handy. PM me if you're planing a trip and I can lead you to where you can find helpful maps, shortcuts, & route-planning to get down there.