Hydrohistorian
← Basin trends · All gages in this district
Loutsenhizer Arroyo at Highway 50 near Olathe
River gage · LOUARRCO · USGS 383926107593001 · Division 4 · Water District 41 · Montrose County
Live gage at DWR ↗ · USGS monitoring location ↗ · Download daily record (CSV)
Source DWR administrative record · verify at DWR station ↗ Source Independent agency measurement · verify at USGS ↗ Source Our computation, no independent reference · computed here from the screened record
Two different numbers, deliberately: Flowing now is raw 15-minute telemetry, provisional and unreviewed. Latest cached reading is the end of the verified daily record. They are never merged, and the verified series is the one the trend is computed on.
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.
The water itself
USGS keeps a sensor here. Latest readings, with the last 30 days of daily means beside each. Provisional: not yet reviewed by USGS, and revised when it is.
Fetched 2026-10-25 06:22 UTC from USGS NWIS (site 383926107593001). The USGS page has the full sensor record; every Colorado sensor site is listed on one page.
Annual flow & trend
Chart: annual mean flow at Loutsenhizer Arroyo at Highway 50 near Olathe, water years 2014 to 2026. The measured record is no trend at -10.58 cubic feet per second per decade. The underlying yearly values are available as a CSV download linked at the top of this page.
Where it sits
Location as DWR records it (5.0).
Provenance
DWR station abbreviation LOUARRCO; recorded station name “LOUTSENHIZER ARROYO AT HWY 50 NEAR OLATHE, CO”; operated by USGS. 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.