US lakes & pondsUS lakes & pondsSurface area: The USGS National Hydrography Dataset outline (NHD Permanent ID 25528870).
The red circle marks Alder Lake.
Towns and counties: U.S. Census Bureau boundaries overlaid on the USGS lake outline.
Official NYSDEC pages. Rules and fees change; check before you go.
Built only from the data on this page: official access lists, OpenStreetMap beaches and trails, campground listings, state and USGS invasive-species records. We don't rate crowds or water quality.
Numbers on the map match the list at rightbelow.
Shoreline: USGS National Hydrography Dataset (NHD Waterbody, Permanent ID 25528870), public domain. State outline: U.S. Census Bureau TIGERweb. Points: NYSDEC boat launch sites (data.ny.gov). Dashed trails: © OpenStreetMap contributors (ODbL). Interactive map: Leaflet with © OpenStreetMap contributors. Not for navigation.
OpenStreetMap shows about 1.1 mi of public hiking and walking trail within about 80 m (260 ft) of the Alder Lake shoreline, mostly along the north and south shores. They follow about 75% of the shore, so you can walk most of the way around but not a full loop.
No trailhead is mapped for these trails. The closest public access site is Alder Lake DEC boat launch, 50 ft from a shoreline trail (NYSDEC boat launch data).
The dashed brown line on the lake map shows these trails. We include paths, footways and marked trails that OpenStreetMap doesn't mark as private, and leave out roads, sidewalks and snowmobile corridors. Mapped trails can still cross private land or close for the season, and not every trail is mapped, so follow posted signs.
Trails: © OpenStreetMap contributors, available under the Open Database License (ODbL). Map data as of Oct 9, 2026. Trail lengths count only the parts within about 80 m of the USGS NHD lake outline.
We found 12 campgrounds and RV parks within 15 miles of Alder Lake, 1 of them within 5 miles. Distances are straight-line from the nearest point on the shoreline, so driving distance is longer.
Electric hookups · RVs welcome · Wi-Fi
Cabins or yurts
All campgrounds & RV parks in New York
Green tent icons on the lake map mark campgrounds near the shore, and the interactive map shows the closest 12. Amenities are listed only where a source records them; call or check the campground's website before you go, since seasons and rates change every year.
Campground data: OpenStreetMap contributors (ODbL). Pulled Oct 12, 2026.
Live from the National Weather Service API for the lake's coordinates (42.0496, -74.6770). The nearest station may be several miles away. NWS forecast for Alder Lake. No live water-temperature sensor is shown because we haven't found a public one for this lake.
Based on solunar theory, an estimate. Major periods (about 2 hours) center on when the moon is directly overhead or underfoot; minor periods (about 1 hour) center on moonrise and moonset. The 0–100 activity score rises during those periods and gets a boost near sunrise and sunset and around the new and full moon. Weather, water temperature and pressure often matter more. Sun and moon times are calculated in your browser from the lake's coordinates with standard astronomy formulas, shown in ET (America/New_York), and accurate to within a few minutes.
1 public access site listed.
| Site | Town | Owner | Type | Parking | Fee | Uses | Map |
|---|---|---|---|---|---|---|---|
| Alder Lake DEC boat launch | Hardenburgh | NYSDEC | Hand Launch | 10 car | — | Boating | 42.0499, -74.6804 |
NYSDEC boat launch sites (data.ny.gov)
Fees, hours and rules change; confirm with the site owner before you go.
Alder Lake covers about 45 acres in Hardenburgh, New York (Ulster County).
No trailer ramp is listed, but there is 1 public access site for car-top boats or shore access.
Yes. We list 12 campgrounds and RV parks within 15 miles, 1 of them within 5 miles.
Alder Lake touches Hardenburgh in Ulster County, New York.
Know Alder Lake? Tell us about the launch, parking, where they're biting or anything a first-time visitor should know. Tips go privately to the LakeRipple editor; nothing is posted automatically. Helpful tips may be featured on this page (we'll use your first name only if you give one).
Straight-line distance between lake centers. All New York lakes & ponds · All waters in Hardenburgh