John Martin Reservoir

Name: John Martin Reservoir (Colorado) water level
Creator: U.S. Geological Survey

At Caddoa, CO · Colorado · USGS gauge

Water level · NGVD29

3,805.84FT

Gauge elevation · no % full published

7 days +0.23 ft30 days +4.54 ftvs last year +5.53 ft

Reading for Oct 25, 2026, 18:15 UTC · page refreshed Oct 25, 21:53 UTC
Source: U.S. Geological Survey (Water Data for the Nation)

Worth going today?This Afternoon

Storms in the forecast

Light wind, dry

Wind10 mph

Rain24%

Temp58°F

Level3,805.8 ft

This AfternoonSlight Chance Showers And Thunderstorms · 58°F
ESE 10 mph · rain 24%

TonightChance Showers And Thunderstorms then Showers And Thunderstorms · 45°F
SE 5 to 10 mph · rain 87%

NWS forecast for the gauge location. Good = wind ≤ 10 mph and rain ≤ 30%; storms are flagged. Not safety advice – check local conditions, closures and warnings.

Field notes

John Martin Reservoir's latest daily level (Oct 25, 2026) is 3,805.84 (NGVD29) ft.

Over the past 7 days the lake has been rising (+0.23 ft), and it is +4.54 ft over 30 days.

Compared with a year ago (3,800.31 ft, same time of day), the lake is 5.53 ft higher.

Readings come from the USGS gauge “JOHN MARTIN RESERVOIR AT CADDOA, CO”. Gauge elevations are not directly comparable between lakes because each uses its own datum.

Lake facts

Gauge / station	JOHN MARTIN RESERVOIR AT CADDOA, CO
Elevation datum	ft (NGVD29)
Gauge location	38.0681, -102.9374

Nearby lakes

Pueblo Reservoir98 mi W4,858.25 ft+0.02 ft Lake Maloya109 mi SW · NM7,509.85 ft+0.72 ft Trinidad Lake109 mi SW6,175.23 ft+1.50 ft Palo Duro Reservoir154 mi SE · TX

0.4% full−0.01 ft Horsethief Reservoir157 mi E · KS2,419.77 ft−0.09 ft

Common questions

Is John Martin Reservoir rising or falling?

Over the last 7 days it changed +0.23 ft and over 30 days +4.54 ft.

How full is John Martin Reservoir?

USGS publishes the water surface elevation for this gauge but not a percent-full figure, so we don't show one rather than estimate it.

How often is this page updated?

The page is rebuilt automatically every day from USGS's published data. Values can be revised later by the source agency.

Where does the data come from?

The U.S. Geological Survey's Water Data API (api.waterdata.usgs.gov), which publishes readings from USGS and partner gauges. Forecasts come from the National Weather Service.

Latest instantaneous reading; 7-day, 30-day and year-ago changes compare readings at the same hour. USGS data are provisional and subject to revision. This page is not affiliated with or endorsed by the USGS. See data sources.