Echo Lake-Deep Spot
Grafton County, New Hampshire38 acresView mapDirections
NHDES publishes the water-quality measurements for Echo Lake-Deep Spot. Here is what has been measured.
- Impaired · Mercury
- Public access
- Limited data
Echo Lake-Deep Spot in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 2.9 µg/L. Surface area: 38 acres.
Echo Lake-Deep Spot is a 38-acre lake in Grafton County, New Hampshire. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-06-11. Methodology: how these readings are compared.
What Echo Lake-Deep Spot is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Camping1 public campground nearby
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Echo Lake-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, metals (other than mercury), pH / acidity. Check local advisories before you swim.
Whether Echo Lake-Deep Spot is safe to swim in today is a call for the New Hampshire Department of Environmental Services and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Echo Lake-Deep Spot
These are the measurements NHDES publishes for Echo Lake-Deep Spot, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 5 µg/L. Chlorophyll-a 2.9 µg/L. TSI 34.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 2.9µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 34 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Echo Lake-Deep Spot
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
38 acres
Public access
Yes
Listed by NHDES
No bathymetric survey has been published for Echo Lake-Deep Spot, so its depth is not documented here.
Recreation & Access
- Franconia Notch State ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Echo Lake-Deep Spot
- Coppermine Shelter3.0 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Stays via Stay22
Stays near Echo Lake-Deep Spot
Compare lakeside cabins, hotels, and vacation rentals near Echo Lake-Deep Spot in Grafton County, New Hampshire — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Echo Lake-Deep Spot
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Fishing Echo Lake-Deep Spot
Reservoir Info (USACE NID)
Echo Lake-Deep Spot is a man-made reservoir impounded by the Echo Lake Dam (completed 1990), built primarily for recreation on the Lafayette Brook; earth-type dam, 7 ft tall and 40 ft long.
- Surface area
- 38 ac
- Normal storage
- 570 ac-ft
- Max storage
- 725 ac-ft
- Drainage area
- 0.67 sq mi
- Hazard class
- Low
- Owner
- NH DNCR
Source: USACE National Inventory of Dams, NID ID NH01048 · Operator website · Matched by proximity (0.41 km)
EPA Impairment Status
Echo Lake-Deep Spot is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK801030302-01-01 · Official waterbody report
Nearby Lakes in Grafton County
Frequently asked questions about Echo Lake-Deep Spot
Where is Echo Lake-Deep Spot?
- Echo Lake-Deep Spot is a lake in Grafton County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Echo Lake-Deep Spot?
- Echo Lake-Deep Spot in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 2.9 µg/L. Surface area: 38 acres.
Is Echo Lake-Deep Spot safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Echo Lake-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, metals (other than mercury), pH / acidity. Check local advisories before you swim.
Are there boat ramps on Echo Lake-Deep Spot?
- Echo Lake-Deep Spot has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Franconia Notch State Park. Public access is listed as yes.
Can I fish at Echo Lake-Deep Spot?
- Echo Lake-Deep Spot has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by New Hampshire's fish and wildlife agency, so check its current regulations before you go.
Are there campgrounds on Echo Lake-Deep Spot?
- Echo Lake-Deep Spot has 1 public campground from USGS The National Map within 5 km, including Coppermine Shelter. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
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Where this data comes from
2 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133002 samples · 2020
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
- CHLOROPHYLL A-B-C DETERMINATION (MODIFIED)
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles