Rivermatics

USGS Streamgage 09419800

Lv Wash below Lake Las Vegas near Boulder City, NV

Lv Wash below Lake Las Vegas near Boulder City, NV is USGS streamgage 09419800 in Nevada, monitoring river discharge in hydrologic subbasin 15010015. It sits on the Lv Wash, alongside 4 other gauges Rivermatics tracks on the same river. It drains a watershed of about 2,193 square miles. Discharge records at this site go back to 1964. Typical flow runs near 259.4 cfs in July and 270.6 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

View live conditions & forecast →

Gauge details

State
Nevada
Drainage area
2,193 sq mi
Gauge elevation
1,250 ft
Subbasin (HUC-8)
15010015
Coordinates
36.1222, -114.90499
USGS site number
09419800
Records begin
1964-06-26 (62 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Lv Wash below Lake Las Vegas near Boulder City, NV. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
293 299 305
290 299 307
289 299 308
288 299 310
287 299 311
289 306 346
295 343 561
291 313 359
289 308 343
288 311 364
286 309 349
285 306 336
283 304 334
283 303 329

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 57 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 71 292.5 351.2
February 70.2 292.5 359.6
March 62 284.3 342.5
April 58.7 270.6 328.8
May 52.7 256.2 321.3
June 43.2 250.8 310.6
July 44.3 259.4 330.7
August 51.7 262.1 338.1
September 53 263.2 334
October 65.5 276.4 338.7
November 70.9 285.9 341.7
December 74.8 289.5 347.4

All values in cubic feet per second (cfs).

Common questions

When does Lv Wash below Lake Las Vegas near Boulder City, NV normally run highest?
January, on the long-term record. The median daily flow that month is about 292.5 cfs, against 250.8 cfs in June, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Lv Wash below Lake Las Vegas near Boulder City, NV?
It depends on the month. In January, half of days historically fall near 292.5 cfs, with the middle 80% of days between 71 and 351.2 cfs. The month-by-month table on this page gives the full range.
How long has Lv Wash below Lake Las Vegas near Boulder City, NV been measured?
Discharge records at USGS site 09419800 begin in 1964, about 62 years, covering roughly 8,802 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Lv Wash below Lake Las Vegas near Boulder City, NV?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow 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 the live gauge screen. Open live conditions to see the current outlook.
Where is Lv Wash below Lake Las Vegas near Boulder City, NV?
The gauge sits at 36.1222, -114.90499, in Nevada, in hydrologic subbasin 15010015, at an elevation of about 1,250 feet, draining roughly 2,193 square miles.
Can I use Lv Wash below Lake Las Vegas near Boulder City, NV 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.

Upstream and downstream on the Lv Wash

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Lv Wash in full.

Other gauges in this subbasin