John Martin Lake Water Level Today
Colorado · near Hasty · Well below full pool
- Elevation
- 3,801.05 ft
- From full pool
- −50.79 ft
- Percent of pool
- 26.2%
- 24-hour change
- +0.08 ft
- 7-day change
- −0.21 ft
- Reading
- Sep 21, 2026 · USACE
Last year at John Martin Lake
John Martin Lake is 50.79 ft below full pool, at 3,801.05 ft, up 0.08 ft in the last 24 hours. That puts the lake at 26.2 percent of its conservation pool. The top of the flood pool is 68.9 ft higher, at 3,870.00 ft.
Over the last 7 days the level fell 0.21 ft, and over 30 days it fell 0.88 ft. In the 400 days of readings on this page the high was 3,812.61 ft on Apr 15, 2026 and the low was 3,800.08 ft on Oct 29, 2025, a range of 12.53 ft.
The reading is the U.S. Army Corps of Engineers gauge at John Martin Dam, near Hasty, taken Sep 21, 2026 and referenced to the NGVD29 datum. This page is rebuilt once a day from the agency feed; it is not a live gauge, so during a fast rise or a scheduled release check the USACE page for hourly values.
John Martin Lake pool elevations
| Current elevation | 3,801.05 ft |
|---|---|
| Full pool (top of conservation) | 3,851.84 ft |
| Top of flood pool | 3,870.00 ft |
| Bottom of conservation pool | 3,783.00 ft |
| Top of dam | 3,880.00 ft |
| Inflow | 40 cfs |
| Outflow | 14 cfs |
| 30-day change | −0.88 ft |
| 1-year high | 3,812.61 ft (Apr 15, 2026) |
| 1-year low | 3,800.08 ft (Oct 29, 2025) |
| Vertical datum | NGVD29 |
| Operating agency | U.S. Army Corps of Engineers, SPA district |
Source: U.S. Army Corps of Engineers. Read what full pool and flood pool mean.
More lakes in Colorado
- Bear Creek Reservoir 5,544.03 ft, −13.97 ft from full
- Blue Mesa Reservoir 7,414.18 ft, −105.22 ft from full
- Bonny Lake 3,638.00 ft, −34.00 ft from full
- Chatfield Reservoir 5,432.24 ft, −11.76 ft from full
- Cherry Creek Reservoir 5,546.16 ft, −3.84 ft from full
- Lemon Reservoir 8,093.40 ft, −54.53 ft from full
John Martin Lake level questions
What is the water level of John Martin Lake today?
John Martin Lake is at 3,801.05 ft as of Sep 21, 2026, −50.79 ft relative to full pool (3,851.84 ft). The 24-hour change is +0.08 ft.
What is full pool at John Martin Lake?
Full pool, the top of the conservation pool, is 3,851.84 ft (NGVD29). Above that, water is stored temporarily in the flood pool up to 3,870.00 ft. The bottom of the conservation pool is 3,783.00 ft.
Is John Martin Lake rising or falling?
Over the last 24 hours the level is +0.08 ft; over 7 days it fell 0.21 ft, and over 30 days it fell 0.88 ft.
Where does this John Martin Lake level come from?
From the U.S. Army Corps of Engineers (USACE) public data feed for John Martin Dam. Lake Levels Today republishes the agency's daily value without adjustment and links to the source below.