Round Valley Reservoir
Hunterdon County, NJ
MAYBE on Round Valley Reservoir — light winds and rising pressure after a passing system for this window. Watch a front passing through and pressure swinging. Weather-only read (no on-water history calibrating this yet).
Tue · Oct 27, 4 AM → 8 AM (America/New_York)
The latest cached fishing-weather read for Round Valley Reservoir in Hunterdon County, NJ is MAYBE. Its highlighted window has passed, so use the 7-day forecast below for the next available window. The main factor in its favor was dry conditions across the window, while the main watch-out was a front passing through. Its cached forecast evidence included wind near 7 mph out of the west, gusting to 14 mph; surface pressure near 1008 hPa on an unstable trend; 0.00 inches of rain; and air temperature near 63 °F with clear dominant. Confidence in this cached read is low; it was generated October 26, 2026, 8:52 AM UTC, and reads refresh on a daily cadence. This is a weather-only read built from forecast weather; it does not yet use on-water reports, and confidence is capped until local water data or feedback exists.
Conditions at a glance
- Wind
- 7mph
W · gust 14
- Rain / Weather
- 0in
Clear
- Temp
- 63°F
17°C · hum 42%
- Pressure
- 29.77inHg
Unstable
7-Day Fishing Forecast
One read per day — the bite call, the window, the weather behind it
- MAYBEMon · Oct 26Window passedA front passing through68° / 41°F7 mph · Wgust 170.00 in↓ -7.0 hPa
- MAYBETue · Oct 274 AM → 8 AMA front passing through59° / 43°F6 mph · Ngust 200.00 in↑ +7.9 hPa
- MAYBEWed · Oct 284 AM → 8 AMA front passing through59° / 41°F3 mph · Ngust 70.00 in↓ -0.7 hPa
- MAYBEThu · Oct 297 AM → 11 AMA front passing through66° / 46°F3 mph · SWgust 140.00 in↓ -6.4 hPa
- MAYBEFri · Oct 304 AM → 8 AMA front passing through72° / 52°F5 mph · SWgust 250.00 in↑ +1.5 hPa
- MAYBESat · Oct 314 AM → 8 AMA front passing through61° / 46°F6 mph · Ngust 200.00 in↑ +3.8 hPa
- MAYBESun · Nov 19 AM → 1 PMA front passing through64° / 46°F3 mph · Sgust 170.04 in↓ -5.2 hPa
Last 3 days
Recent context — what just happened
Weather-only read. Confidence is capped until local water data or feedback exists.
About Round Valley Reservoir
Round Valley Reservoir, in Hunterdon County, NJ, is New Jersey's second-deepest lake and largest reservoir.
- Surface area
- 2,350 acres
- Max depth
- 180 ft
- Type
- Clear highland reservoir
- Water clarity
- Clear
- Managing agency
- New Jersey Water Supply Authority (reservoir); New Jersey Department of Environmental Protection State Park Service (recreation) and NJ Fish & Wildlife (fishery)
Primary species: Largemouth bass, Smallmouth bass, Brown trout, Rainbow trout, Lake trout, Black crappie, Yellow perch, White perch, Bluegill, Rock bass, Common carp.
How Round Valley Reservoir fishes in different weather
How do cold fronts affect fishing on Round Valley Reservoir?
On a clear, deep highland reservoir like Round Valley Reservoir, the day or two after a cold front is the toughest window of the year. Bluebird high pressure and falling water temperatures push fish down and tight to structure, and the bite often stays pinched for roughly a day and a half to two days before it rebounds. The adjustment is to slow down and fish deeper, more vertical presentations along the first major drop, and to save your effort for the calmer, cloudier days on either side of the front.
Does wind help or hurt the bite on Round Valley Reservoir?
Because Round Valley Reservoir runs clear, a little wind tends to switch the bite on rather than off. Surface chop scatters light, shrinks a fish's comfort with the shallows, and stacks bait against wind-hit banks and points, all of which draw active fish up and make them easier to fool. The toughest scenario is a windless, high-sky day over glassy water. Follow the wind to the banks it is blowing into when it is up, and slide out to deeper, subtler presentations when the lake goes flat.
How does barometric pressure change fishing on Round Valley Reservoir?
Falling barometric pressure — the hours as a front approaches — is one of the most dependable feeding triggers of the year on Round Valley Reservoir. Fish sense the drop and often feed hard before the weather turns. Once the front passes and pressure climbs into a stable high, the bite tightens and fish move deeper and slower. The takeaway is to be on the water during the falling-pressure window, and to shift to patient, deep, slow presentations once high pressure settles in.
Where are the fish in summer on Round Valley Reservoir?
Through the warm months, Round Valley Reservoir stratifies into layers and a thermocline forms that fish relate to closely — the band just above it holds oxygen, comfortable temperatures, and bait, so gamefish stack along it. The daytime feeding window narrows in the heat, which is why night fishing is a strong summer tradition on clear highland lakes. Adjust by finding the thermocline depth on your electronics and working presentations right at its upper edge, and by fishing the low-light and after-dark hours.
When is the best time of year to fish Round Valley Reservoir?
Think in terms of water temperature on Round Valley Reservoir. Spring's warming trend draws fish shallow to spawn once temperatures climb through the mid-fifties, a prime and approachable window. Summer stratification sends them deep and rewards low-light effort. Autumn opens with turnover — a short, tougher stretch as the lake mixes — before falling temperatures set off an aggressive pre-winter feed. In winter, fish hold deep and suspended and bite slowly. Read the thermometer, and let it, not the date, tell you where and how to fish.
Nearby waters
- Sunset Lake· Somerset County, NJ
- Sylvan Lake· Somerset County, NJ
- Hunt Lake· Mercer County, NJ
- Schiller Pond· Hunterdon County, NJ
- Budd Lake· Morris County, NJ
- Mount Kemble Lake· Morris County, NJ
Weather data by Open-Meteo — CC BY 4.0. Fishing Weather derives the fishing read.