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The Colorado Department of Public Health and Environment has issued the following... WHAT...Air Quality Health Advisory for Ozone. WHERE...Douglas, Teller, western Elbert, western El Paso and central Arapahoe Counties. Locations include, but are not limited to Castle Rock, Kiowa, Monument, Manitou Springs, and Woodland Park. WHEN...200 PM Tuesday April 21 to 1000 PM Tuesday April 21 IMPACTS...Ozone concentrations could reach the Unhealthy for Sensitive Groups category within the advisory area Tuesday afternoon and evening. Ozone levels will improve overnight Tuesday night. HEALTH INFORMATION...Public Health Recommendations: Increasing likelihood of respiratory symptoms and breathing discomfort in active children and adults and people with lung disease, such as asthma. Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy outdoor exertion.
Hackensack River
Last Updated: April 21, 2026
Total streamflow across the
Hackensack River
was last observed at
37
cfs, and is expected to yield approximately
74
acre-ft of water today; about 16%
of normal.
River levels are low and may signify a drought.
Average streamflow for this time of year is
232 cfs,
with recent peaks last observed
on
2011-08-29 when daily discharge volume was observed at
14,660 cfs.
Maximum discharge along the river is currently at the
Hackensack River At Rivervale Nj
reporting a streamflow rate of 27.1 cfs.
However, the streamgauge with the highest stage along the river is the
Hackensack River At West Nyack Ny
with a gauge stage of 2.44 ft.
This river is monitored from 3 different streamgauging stations along the Hackensack River, the highest being situated at an altitude of 57 ft, the
Hackensack River At West Nyack Ny.
The Hackensack River is a 45-mile long waterway that flows through northeastern New Jersey into Newark Bay, separating Bergen and Hudson counties.
15-Day Long Term Forecast
River Details
| Last Updated | 2026-04-21 |
| Discharge Volume | 74 ACRE-FT |
| Streamflow |
37.3 cfs
Past 24 Hours: -3.2 cfs (-7.9%) |
| Percent of Normal | 16.06% |
| Maximum |
14,660.0 cfs
2011-08-29 |
| Seasonal Avg | 232 cfs |
River Streamflow Levels
| Streamgauge | Streamflow | Gauge Stage | 24hr Change (%) | % Normal | Minimum (cfs) | Maximum (cfs) | Air Temp | Elevation |
|---|---|---|---|---|---|---|---|---|
|
Hackensack River At West Nyack Ny
USGS 01376800 |
10 cfs | 2.44 ft | -16.39 | |||||
|
Hackensack River At Rivervale Nj
USGS 01377000 |
27 cfs | 1.63 ft | -4.24 | |||||
|
Hackensack River At New Milford Nj
USGS 01378500 |
6 cfs | 1.42 ft | -11.77 |
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile
The Hackensack River is a river, approximately 45 miles (72 km) long, in the U.S. states of New York and New Jersey, emptying into Newark Bay, a back chamber of New York Harbor. The watershed of the river includes part of the suburban area outside New York City just west of the lower Hudson River, which it roughly parallels, separated from it by the New Jersey Palisades. It also flows through and drains the New Jersey Meadowlands. The lower river, which is navigable as far as the city of Hackensack, is heavily industrialized and forms a commercial extension of Newark Bay. Once believed to be among the most polluted water courses in the United States, it staged a modest revival by the late 2000s.
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