There is an active gage on the Rio Sirupa near Huapoca which is a well upstream of the confluence with the Rio Tutuaca.
http://www.conagua.gob.mx/spr/guapoca.html
“Real-time” flow data at the Guapoca gage on the Rio Sirupa is available in the daily Regional Reportes de Presas at:
http://www.conagua.gob.mx/OCNO07/Contenido/Documentos/infor-diaria.pdf
Look for YAQUI in the “CUENCA” column and Guapoca in the “Estacion” column of the HIDROMETRIA table and read the flows for Guapoca in the “GASTO” column. This will be the approximate flow in cumecs (cms). Multiply by 35 for cfs. Suggested flows are from around 70 cms to 200 cms at Guapoca, although you may be comfortable boating this section at lower or higher flows.