Rivermatics

4 USGS Streamgages · Rio Grande system

Costilla Creek flows and levels

Costilla Creek is gauged at 4 USGS streamgages in New Mexico, each tracked by Rivermatics. The mainstem runs about 53 miles (85 km) from headwaters to outlet. It drains into the Rio Grande system. Drainage area at the gauges ranges from 25 square miles at Costilla Creek above Costilla Dam, NM up to 200 at Costilla Creek near Garcia, CO. The gauged reach falls about 1,633 feet, from 9,454 feet down to 7,821. Rivermatics issues a daily machine-learned 14-day flow outlook for every one of them.

Gauges on this river, upstream to downstream

Ordered by drainage area, which is how far down the river each gauge sits. April and July figures are long-term median daily flows for that month from the USGS record — historical normals, not a forecast and not today's reading.

USGS streamgages on this river, ordered upstream to downstream
Gauge State Drainage sq mi Elevation ft April p50 cfs July p50 cfs Forecast
Costilla Creek above Costilla Dam, NM NM 25 9,454 9.4 5.5 14-day
Costilla Creek below Costilla Dam, NM NM 55 9,300 0.2 60.1 14-day
Costilla Creek near Costilla, NM NM 195 7,936 34.1 75.6 14-day
Costilla Creek near Garcia, CO NM 200 7,821 3 1 14-day

Typical flow by month at Costilla Creek near Garcia, CO

The furthest-downstream gauge on this river, so the fullest flow it carries here. Long-term daily discharge percentiles from the USGS record (up to 61 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Only 11 of 12 months have enough record to summarize; the rest are omitted.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January — 1.1 —
March 0 7.9 28.2
April 0 3 69.5
May 0 9.2 118.5
June 0 6.7 49.3
July 0 1 15.8
August 0 0.3 11.8
September 0 0 5.6
October 0 0.4 6.3
November 0 2.4 12
December — 3.3 —

All values in cubic feet per second (cfs).

Common questions

When does the Costilla Creek run highest?
May, on the long-term record at Costilla Creek near Garcia, CO — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 9.2 cfs that month, against 0 cfs in September, the lowest. Upstream gauges peak on their own schedule; the table on this page gives April and July for each.
How many gauges are on the Costilla Creek?
Rivermatics tracks 4 USGS streamgages on the Costilla Creek, across New Mexico. Each has its own page with the site's full flow record and monthly normals. The river may carry other gauges that publish neither daily values nor discharge statistics; those are not tracked here.
Is there a flow forecast for the Costilla Creek?
Yes, at 4 of the 4 gauges. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on each basin's observed flows, weather and snowpack, and issues a daily outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on each gauge's live screen.
What river system is the Costilla Creek part of?
The Costilla Creek drains into the Rio Grande system — it is a tributary somewhere in that chain, following the flowpath down to its terminal river. Rivermatics builds this from the USGS/geoconnex reference-mainstem network rather than from names.
Can I use Costilla Creek data for flood or safety decisions?
No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.

Other rivers in the Rio Grande system

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