USGS · 06730525

ST VRAIN CR BLW BOULDER CR RIVER

USGS · 06730525LIVE

ST VRAIN CR BLW BOULDER CR AT HWY 119 NR LONGMONT

COLORADO40.1605°N, -105.0079°W Updated 6 hr ago

FLOW RATE

56cfs

AIR TEMP

70°F

WIND

6mph ENE

FISH INDEX

69SCORE / 100

GREAT · 4 OF 5

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 30 DAY

56cfs 79.9% vs avg

Optimal band: 50–68 cfs

PERIOD HIGH

474cfs

PERIOD LOW

37cfs

RUNNABLE

52%

last 30 day in band

Precipitation History

Precipitation · YTD

Dry

Drier than normal

2026 to date

7.7in

-34% vs normal

7.66 in of precipitation so far this year, 34% below the 30-year normal of 11.67 in for this point in the season.

YTD Total

7.7in

This year so far

Normal to Date

11.7in

30-yr average

Typical Range

8.1–14.9in

10th–90th pct YTD

Departure

-34%

vs 30-yr normal

By Month

This year

Typical range

Normal

Jan: 0.69" · normal 0.75" (0.2–1.1)

Jan

Feb: 0.25" · normal 0.78" (0.2–1.4)

Feb

Mar: 1.21" · normal 1.64" (0.8–2.7)

Mar

Apr: 0.93" · normal 2.63" (1.1–4.0)

Apr

May: 3.57" · normal 3.32" (1.7–5.5)

May

Jun: 0.92" · normal 2.12" (0.4–4.1)

Jun

Jul: 0.11" (so far)· normal 1.69" (0.5–3.1)

Jul

Aug: normal 1.59" (0.4–3.0)

Aug

Sep: normal 1.53" (0.3–2.8)

Sep

Oct: normal 1.59" (0.6–2.7)

Oct

Nov: normal 1.07" (0.5–2.0)

Nov

Dec: normal 0.71" (0.3–1.2)

Dec

Baseline 1991–2020 · Source: Open-Meteo01:36 AM

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Station Location

40.1605, -105.0079

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DATA · USGS · NOAA · NWSUPDATED 2026-07-08 00:00 UTC

Site #06730525·USGS

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