Hydrohistorian
Oso Diversion near Chromo
Transbasin diversion gage · OSODIVCO · Division 7 · Water District 77 · Archuleta County
What this gage meters
This is not a natural stream record. The Azotea Tunnel (San Juan-Chama Project) moves water from Navajo, Little Navajo and Rio Blanco headwaters (Div 7) into Rio Grande basin at Chama, New Mexico, operated by USBR — so this record is a ledger of those deliveries. Trends here reflect operational and demand decisions, not the basin's hydrology, and the basin trends page marks it accordingly (⇆). All of Colorado's curated transbasin diversions are collected at /transbasin.
The record
Readings come from the weekly-refreshed cache, never fetched live — the date beside the value says exactly how fresh it is. The live gage is one click up.
Annual flow & trend
Where it sits
Location as DWR records it (5).
Provenance
DWR station abbreviation OSODIVCO; recorded station name “OSO DIVERSION NEAR CHROMO,CO.”; operated by DWR. Daily flows from the DWR HydroBase snapshot plus CDSS REST updates, refreshed on the weekly cycle. Trend statistics are Mann-Kendall (Hamed-Rao corrected) with Sen's slope in native cfs, the same numbers as the basin Trends tab.