Spent a lot of time searching for info on the Santa Fe County portion of the Santa Fe River Trail and trying to determine if Santa Fe River crosses I-25 on its way to the Rio Grande.  Could trace path of Santa Fe River on Google Maps satellite view but then lost it somewhere on the Caja del Rio.  I know it crosses NM599.  Need to look at hard copy map, with aid of magnifying glass.

The information I found about the Santa Fe River Trail in Santa Fe County:  There is a .7 mile long dirt path along the Santa Fe River between San Isidro (Ysidro) Crossing and Caja del Oro Grant Road.  As an add-on at the path's western end, you can turn right to walk to Aqua Fria Park.  A 5,300' section is due to be completed in March 2012 at El Camino Real Park between Constellation Way and Cottonwood Drive and will include "two steel truss span bridges".  It's unclear if it will be a paved or dirt path. This section will be near NM 599, the Santa Fe Relief Route.   I couldn't find any information on El Camino Real Park.  so maybe that park is being built along with the trail or possibly Google Maps is not up to date.  These two trail sections are well west of Frenchy's Field which is the end-point of the paved Santa Fe River Trail in the city of Santa Fe.