Northeast
Big Flat Brook
Live Conditions
Big Flat Brook — Near Flatbrookville, NJ (gauge unverified)
7-Day Flow
↓ Falling
24-Hr Pressure
29.07 inHg · → High/stable
Voluntary Catch-and-Release Advisory
Water temperature is at or above 68°F. At these temperatures trout are physiologically stressed and have a higher post-release mortality rate. Consider waiting for cooler conditions — early morning or evening — or choosing a tailwater with regulated temperatures.
Local Weather
Tough conditions — fish deep
Today
☁️Overcast
82° / 52°
Tomorrow
🌧️Rain
67° / 51°
0.28"
Thu
🌧️Rain
58° / 46°
0.15"
Fri
☁️Overcast
53° / 41°
0.01"
Cold front incoming — go deep with nymphs, surface activity likely slow.
Weather by Open-Meteo · No API key · Updated every 30 min
What should I fish today?
One call. Specific to today's exact conditions on the Big Flat Brook.
5.4
What should I pack?
Rod, flies, tippet, and safety gear specific to today's Big Flat Brook conditions.
🪰 Hatch Calendar
Big Flat Brook · May · Late Spring
🟡 Approaching — within 5°F of trigger range
Select month
HENDRICKSON peak. Caddis. Sulphurs (size 16-18). Wild browns and brookies active.
🟢 Active · 🟡 Approaching · ⚪ Seasonal only
River Map
About Big Flat Brook
Big Flat Brook in Sussex County is arguably New Jersey's finest wild trout stream, tumbling through Stokes State Forest in a freestone gradient that holds self-sustaining populations of brown and brook trout alongside stocked fish. The upper reaches are tighter and more classic brook trout water, while the lower sections open up for longer drifts and bigger browns. Its proximity to the Delaware Water Gap and limited access roads keep pressure manageable.
Regulations
Trophy Trout sections in place — check NJDEP for special area boundaries, size limits (typically 15" minimum), and seasonal restrictions. Wild trout in upper reaches are sensitive; handle with care. Standard NJ trout season applies outside trophy sections. NOTE: USGS gauge 01440000 is unverified — flow data may be stale or unavailable; check with local outfitters as backup.