Henry'S Lake @ Boat Ramp
Fremont County, IdahoView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- 158 ft max depth
- Public access
- Limited data
Henry'S Lake @ Boat Ramp in Fremont County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 1.5 µg/L.
- Max depth
- ~158 ft est.
- Phosphorus
- 11 µg/L
- Chlorophyll-a
- 1.5 µg/L
- Public access
- Yes
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Watch Henry'S Lake @ Boat Ramp’s letter
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Why Henry'S Lake @ Boat Ramp has no grade
We grade a lake only when the monitoring record supports a letter: 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 Henry'S Lake @ Boat Ramp, 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 IDEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Henry'S Lake @ Boat Ramp is a lake in Fremont County, Idaho with an estimated average depth of about 158 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, IDEQ, last sampled 2018-07-18. Grade methodology: LakeQuality methodology.
What Henry'S Lake @ Boat Ramp is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Henry'S Lake @ Boat Ramp
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 11 µg/L. Chlorophyll-a 1.5 µg/L. TSI 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 11 µg/L | Not graded |
| Chlorophyll-a (Algae) | 1.5 µg/L | Not graded |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~158 ft est. |
| Average Depth | ~25 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Idaho has not published bathymetry for Henry'S Lake @ Boat Ramp.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Henrys Lake State ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Henry'S Lake @ Boat Ramp
Graded lakes near Henry'S Lake @ Boat Ramp
Henry'S Lake @ Boat Ramp has no grade, but these lakes within a short drive do.
Nearby Lakes in Fremont County
Frequently asked questions about Henry'S Lake @ Boat Ramp
Where is Henry'S Lake @ Boat Ramp?
- Henry'S Lake @ Boat Ramp is a lake in Fremont County, Idaho. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Henry'S Lake @ Boat Ramp?
- Henry'S Lake @ Boat Ramp in Fremont County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 1.5 µg/L.
Is Henry'S Lake @ Boat Ramp safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Henry'S Lake @ Boat Ramp?
- No published bathymetric survey covers Henry'S Lake @ Boat Ramp, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 158 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Henry'S Lake @ Boat Ramp?
- Henry'S Lake @ Boat Ramp has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Henrys Lake State Park. Public access is listed as yes.
Explore Henry'S Lake @ Boat Ramp across LakeQuality
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Where this data comes from
2 measurements from 1 monitoring station, 2018. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Bureau of Reclamation
1119USBR_WQX2 samples · 2018
Analytical methods
- Phosphorus by Single Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory