CO DWR · ARKPORCO

ARKANSAS RIVER

CO DWR · ARKPORCOLIVE

Arkansas River At Portland, Co.

COLORADO38.3882°N, -105.0157°W Updated 1 d ago

FLOW RATE

69cfs

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 YEAR

69cfs

Optimal band: 235–319 cfs

PERIOD HIGH

785cfs

PERIOD LOW

69cfs

RUNNABLE

38%

last 1 year in band

Precipitation History

Precipitation · YTD

Dry

Drier than normal

2026 to date

4.3in

-51% vs normal

4.35 in of precipitation so far this year, 51% below the 30-year normal of 8.82 in for this point in the season.

YTD Total

4.3in

This year so far

Normal to Date

8.8in

30-yr average

Typical Range

4.8–12.0in

10th–90th pct YTD

Departure

-51%

vs 30-yr normal

By Month

This year

Typical range

Normal

Jan: 0.42" · normal 0.59" (0.2–0.9)

Jan

Feb: 0.28" · normal 0.64" (0.3–1.0)

Feb

Mar: 1.10" · normal 1.35" (0.5–2.4)

Mar

Apr: 0.60" · normal 2.06" (0.7–3.2)

Apr

May: 1.64" · normal 2.09" (0.6–4.0)

May

Jun: 0.33" · normal 1.69" (0.5–3.3)

Jun

Jul: 0.00" (so far)· normal 2.52" (1.0–4.4)

Jul

Aug: normal 2.27" (0.8–4.0)

Aug

Sep: normal 1.18" (0.3–2.3)

Sep

Oct: normal 1.10" (0.3–2.1)

Oct

Nov: normal 0.72" (0.2–1.4)

Nov

Dec: normal 0.51" (0.2–0.8)

Dec

Baseline 1991–2020 · Source: Open-Meteo11:09 AM

Your History · Arkansas River At Portland, Co.

Track your history

Station Location

38.3882, -105.0157

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DATA · CO DWR · NOAA · NWSUPDATED 2026-07-06 00:00 UTC

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