Flooding in West Milford, New Jersey: the record, the lakes and brooks, and what to do
West Milford is mountain country, the headwaters of rivers that flood towns further south. Its own flooding is smaller and more local: low-lying land along brooks, lake edges and a handful of roads. One storm dominates the record.
FEMA records 127 flood insurance claims in West Milford, home to 24,705 people. A single storm, Hurricane Irene in August 2011, accounts for 33 of them. FEMA's Flood Insurance Study names Belcher Creek, Morsetown Brook and several smaller brooks as the township's flood sources, with problems in low-lying land and around Union Valley Road. This page sets out what the record shows and what it means for owners and renters.
The short version
- FEMA records 127 flood insurance claims in West Milford; Hurricane Irene alone accounts for 33.
- As of August 2026, FEMA lists 13 repetitive-loss properties in the township, three of them severe repetitive loss.
- FEMA names Belcher Creek, Morsetown Brook and the Union Valley Road area, plus Longhouse Creek, Cooley Brook and Green Brook, as flood sources.
- Greenwood Lake, 1,920 acres, feeds the Wanaque River; the Pequannock flows from the township toward Bloomingdale.
- Most West Milford brooks have no gauge, so the flash flood warning is the signal to act.
West Milford in the flood record
The US Census Bureau counts 24,705 residents in 10,142 homes, with a median year built of 1968 and only about 11.3 per cent of households renting (American Community Survey, 2020–2024). FEMA flood insurance data list 127 National Flood Insurance Program claims in the township over the life of the programme. The pattern is lopsided. 2011 produced 42 claims, more than twice the next year, 1999 with 19; 1984 had 16 and 1980 had 11. By named event, FEMA records 33 claims from Hurricane Irene, 19 from Hurricane Floyd, and six each from the late winter storms and the March 2010 nor'easter. As of August 2, 2026, FEMA lists 13 West Milford properties as repetitive-loss properties, three of them in the severe repetitive-loss category. For a township of this size, those are modest numbers, but they are concentrated.
High ground, many lakes
FEMA's Flood Insurance Study describes the northern half of Passaic County as very mountainous, with a multitude of lakes and streams, and places the county's highest point, 1,450 feet above sea level, in West Milford. Steep ground limits broad floodplains, which helps explain a modest claims total for a township of this size; it also makes West Milford the headwaters for towns downstream. Greenwood Lake, which the US Environmental Protection Agency puts at 1,920 acres, strongly influences the Wanaque River that leaves it, and FEMA gives the lake a drainage area of 27.1 square miles at its spillway. The Pequannock River, gauged at the Macopin intake dam in Passaic County, flows on to Bloomingdale and Butler. FEMA's Pompton basin model includes Greenwood Lake and several reservoirs because their storage can change how a flood moves downstream.
The streams FEMA names
The Flood Insurance Study is specific. It says West Milford is subject to additional flooding from Belcher Creek and Morsetown Brook in low-lying areas, and at Union Valley Road and its vicinity. It adds that low-lying land beside Longhouse Creek, Cooley Brook, Green Brook and the branches of Belcher Creek is also subject to flooding. Separate FEMA studies cover Post Brook and branches of West Brook within the township. FEMA estimated flows on Longhouse Creek, Cooley Brook, Green Brook and Morsetown Brook with a regional method because they have no river gauge, which tells you something important: there is no live reading to watch. They respond directly to the rain falling on them, and the warning a resident gets is the National Weather Service flash flood warning, not a forecast crest.
Why Irene stands out
Irene in August 2011 is the largest single event in the township's claims record. Downstream, the National Weather Service gauge on the Pequannock at Macopin, which drains 63.7 square miles according to the US Geological Survey, crested at 7.42 feet on August 28, 2011, close to its 7.5-foot major flood stage. Only five crests on the National Weather Service list are higher, the most recent in April 1984. The same gauge reached 7.17 feet in March 2011 and 6.76 feet on January 10, 2024. Those readings describe the river leaving West Milford rather than conditions at any one West Milford street, but they are a fair measure of how wet the township's hills were. When the Macopin gauge is high, the brooks above it have usually been running out of their banks too.
What the township has planned
FEMA's Flood Insurance Study reproduces the actions West Milford listed in the 2010 Passaic County hazard mitigation plan: backup power, upgrading and improving stormwater culverts, armouring the Lower Pond Dam at Bubbling Spring, stabilising the stream banks at High Crest Dam, replacing the Crescent Road Bridge and the High Crest Drive Bridge, and dredging Belcher Creek. The list is a reminder that in lake country, flood risk is tied to small dams, culverts and bridges as much as to rivers. The study does not record which actions have since been completed, and this page does not either. The 2025 Passaic County plan update holds the current list.
What this means if you own or rent here
The repetitive-loss figures show that where West Milford properties do flood, they tend to flood more than once. Check the address on the FEMA Flood Map Service Center, especially if the property is near Belcher Creek, Morsetown Brook, Union Valley Road or a lake shore; there is no verified township-wide flood-zone percentage. Remember that a steep, rocky lot can still get water in the basement from hillside runoff and a high water table, which is not the same thing as river flooding and is treated differently by insurers. Flood is a separate policy from homeowners or renters insurance, and FEMA states that a new flood policy normally takes 30 days to take effect. Whether a particular loss is covered is decided by your insurer and your policy. Never drive through water over a road, particularly at night on unlit lake roads.
Common questions
Does West Milford, NJ flood?
In places. FEMA records 127 flood insurance claims and 13 repetitive-loss properties in the township. FEMA's Flood Insurance Study names low-lying land along Belcher Creek and Morsetown Brook and the Union Valley Road area, along with several smaller brooks.
Does Greenwood Lake flood?
FEMA models water surface levels on Greenwood Lake and includes the lake in its flood model of the Pompton basin, so lake-front properties can fall inside a mapped flood zone. Whether a particular lakeside address does is shown on the FEMA Flood Map Service Center.
Which storm caused the most flood claims in West Milford?
Hurricane Irene in August 2011, with 33 of the township's 127 FEMA flood insurance claims. 2011 as a whole produced 42 claims.
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