Grover's Mill Pond (NJ): Motor and Boating Rules
Mercer County · near Princeton Junction · managed by New Jersey State Police Marine Services Bureau
- Gas outboard YES
- Electric trolling YES
- PWC / jet ski NO
- Mercer County, NJ
- 31 acres
- 7.5 hp cap
- New Jersey State Police Marine Services Bureau
Quick answer
Grover's Mill Pond carries a 7.5 hp cap. The rated horsepower on your motor's plate is what counts. Common portables — 2.5 to 9.9 hp — fit under it. Grover's Mill Pond in NJ is limited to outboard motors of 7.5 horsepower or less under New Jersey State Police Marine Services Bureau regulations (verified July 26, 2026). Rules change and local ordinances may add restrictions — always confirm with New Jersey State Police Marine Services Bureau before you launch.
Rules at a glance
Plate rating counts — motors rated above 7.5 hp are over the cap even at idle.
What this means in practice
A 7.5 hp cap covers most portable outboards — the common 2.5, 4, 6, and 9.9 hp models all fit under a 10 hp-style limit. Check the plate on your motor: the rated horsepower stamped there is what counts, not how gently you throttle.
PWC exceed a low horsepower cap by design, so the limit on Grover's Mill Pond effectively excludes jet skis. Electric trolling motors sit comfortably inside any horsepower cap and are a common quiet-water choice here.
Hours matter here too: the posted rule is "Power vessels prohibited 11:00 p.m.-7:00 a.m. (N.J.A.C. 13:82-3.7(b))". Outside those hours, the stricter behavior applies — plan dawn and dusk trips around it on Grover's Mill Pond.
Worth knowing about Grover's Mill Pond: N.J.A.C. 13:82-3.7(a): no power vessel powered by a motor in excess of 7 1/2 horsepower may be operated on Grover's Mill Pond. Waterskiing is prohibited at all times (13:82-3.7(c)). DEP Fish & Wildlife Places to Fish table lists the 31-acre pond in West Windsor Township as municipally owned..
Two more New Jersey waters worth a look while you plan: Greenwood Lake (Zoned, Passaic County) and Lake Grinnell (HP limit, Sussex County). For the complete picture, all verified New Jersey lake motor rules sit on one sortable page.
Common mistakes on HP limit water
Forgetting auxiliary motors count. Where the rule caps the motor or combination of motors, a kicker plus main can bust the number together. Check the wording in the source.
Missing the wake rule stacked on top. Horsepower caps often travel with idle-speed or no-wake conditions — the table above lists what applies on Grover's Mill Pond.
Before you launch — verify
- Official rules: New Jersey State Police Marine Services Bureau
- Unsure about a detail? Call the New Jersey State Police Marine Services Bureau district office that covers Mercer County before towing your boat out.
- We last verified this page on .
Rules change and local ordinances may add restrictions — always confirm with New Jersey State Police Marine Services Bureau before you launch.
Frequently asked questions
Are gas motors allowed on Grover's Mill Pond?
Yes, within the 7.5 hp limit. Outboards rated above 7.5 horsepower are prohibited on Grover's Mill Pond. Verified July 26, 2026.
Can I use an electric trolling motor on Grover's Mill Pond?
Yes. Electric trolling motors are allowed on Grover's Mill Pond. A transom-mount motor in the 30–55 lb thrust range with a deep-cycle battery is the typical setup for this class of water.
Are jet skis (PWC) allowed on Grover's Mill Pond?
No — PWC cannot legally run here. Their engines are rated far above the 7.5 hp cap on Grover's Mill Pond.
Who enforces boating rules on Grover's Mill Pond?
The rules summarized here come from New Jersey State Police Marine Services Bureau (city / municipal government), with possible additional ordinances from Mercer County or local municipalities. Any peace officer can cite violations, so treat posted rules as enforceable regardless of who is watching.
Where do I verify the current rules for Grover's Mill Pond?
The Sources section links the exact regulation we summarized, and New Jersey State Police Marine Services Bureau publishes the live version. This page was last checked against it on July 26, 2026.