Echo Lake-Deep Spot
Echo Lake-Deep Spot in Grafton County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 2.9 µg/L. Surface area: 38 acres.
- Area
- 38 acres
- Public access
- Yes
Why Echo Lake-Deep Spot has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Echo Lake-Deep Spot, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Echo Lake-Deep Spot
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 5 µg/L. Chlorophyll-a: 2.9 µg/L. Trophic State Index: 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2.9 µg/L | Not graded |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay 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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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 38 acres |
| Public Access | Yes |
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 from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK801030302-01-01 · Official waterbody report · Matched by proximity (0.11 km)
Graded lakes near Echo Lake-Deep Spot
Echo Lake-Deep Spot has no grade, but these lakes within a short drive do.
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. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Echo Lake-Deep Spot?
- Echo Lake-Deep Spot in Grafton County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 2.9 µg/L. Surface area: 38 acres.
Is Echo Lake-Deep Spot safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Echo Lake-Deep Spot is not rated for water quality — its monitoring record does not meet the evidence bar. Algae concentration (chlorophyll-a) is 2.9 µg/L. Always check local health department advisories before swimming.
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.
Explore Echo Lake-Deep Spot across LakeGrade
More New Hampshire Lake Rankings
Top 25 by overall water quality score
Top 25 by Secchi water clarity
Grade A/B + low algae filter
Panfish-rich, public access
Full state directory
Other Lakes in New Hampshire
Oligotrophic Lakes in New Hampshire
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated 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