Prado Regional Park: toxic algae advisories
Prado Regional Park, San Bernardino County. See all San Bernardino County waters.
What the state's records say
Danger advisory, last posted Sep 4, 2026. No all-clear recorded.
11 reported spots here have an advisory with no all-clear recorded.
Reporting is voluntary, so the state may not have recorded an end even if conditions changed. Check posted signs and the official map.
What this level asks: Toxins may be at levels that can seriously harm people and animals. Stay out of the water and keep children and pets away from the water and the shore.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Prado Regional Park
The state has an advisory on file for Prado Regional Park (Danger advisory), last posted Sep 4, 2026, and no all-clear recorded. Keep your dog out of the water and away from scum on the shore until the state records an end.
Reported spots
The state records each report at a spot, such as a beach or a boat ramp. Each spot's latest deciding record:
| Spot | Status |
|---|---|
| lake-wide | Warning advisory, last posted Sep 4, 2026. No all-clear recorded. |
| lake-wide | Danger advisory, last posted Dec 1, 2022. No all-clear recorded. |
| Prado Lake-Pedal Boat Dock | The state's latest record, from Sep 17, 2021, recommends no advisory. |
| Prado Regional Park-Prado Spillway | The state's latest record, from Aug 31, 2021, recommends no advisory. |
| Prado Lake-Basin#1 N Channel | The state's latest record, from Jun 25, 2021, recommends no advisory. |
| Prado Park Lake, Prado Regional Park | The state's latest record, from Jun 23, 2021, recommends no advisory. |
| Prado Park Lake - Prado Regional Park | Caution advisory, last posted Nov 23, 2020. No all-clear recorded. |
| Prado Park Lake | Danger advisory, last posted Sep 17, 2020. No all-clear recorded. |
| Prado Dog Park, Dike Pond | Caution advisory, last posted Sep 17, 2020. No all-clear recorded. |
| Prado Dog Park, Long Pond SE Corner | Caution advisory, last posted Sep 17, 2020. No all-clear recorded. |
| Prado Dog Park, "T" Pond Lower Pond, South Corner | Caution advisory, last posted Sep 17, 2020. No all-clear recorded. |
| Prado Dog Park,Long Pond, North | Caution advisory, last posted Aug 14, 2020. No all-clear recorded. |
| Prado Dog Park, "T" Pond, 2nd Pond from West Side | Caution advisory, last posted Aug 14, 2020. No all-clear recorded. |
| Prado Dog Park, Navdha Pond, NE Corner | Caution advisory, last posted Aug 14, 2020. No all-clear recorded. |
| Prado Recreation Dog Park Ponds | Caution advisory, last posted Jul 28, 2020. No all-clear recorded. |
Advisory history
Every advisory record the state has published for Prado Regional Park, newest first. "None" is the state's record that no advisory was recommended on that date. "NA" records do not change a status.
| Date | Spot | State's level | Notes |
|---|---|---|---|
| Sep 4, 2026 | lake-wide | Warning | Alert-scum observed; Closure and fish kill; Lake-wide advisory |
| Aug 20, 2026 | lake-wide | Danger | Alert-scum observed; Closure and fish kill; Lake-wide advisory |
| Dec 1, 2022 | lake-wide | Danger | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory |
| Nov 4, 2022 | lake-wide | Danger | Advisory based on visual and toxins; Alert-high concentration toxins; Lake-wide advisory |
| Oct 6, 2022 | lake-wide | Caution | Floating/planktonic bloom observed |
| Sep 2, 2022 | lake-wide | None | No cyano, other algae present. |
| Jun 30, 2022 | lake-wide | None | No cyano, other algae present. |
| Sep 17, 2021 | Prado Lake-Pedal Boat Dock | None | Testing results below posting triggers |
| Aug 31, 2021 | Prado Regional Park-Prado Spillway | None | Testing results below posting triggers |
| Jun 25, 2021 | Prado Lake-Basin#1 N Channel | None | Testing results below posting triggers |
| Jun 23, 2021 | Prado Park Lake, Prado Regional Park | None | Testing results below posting triggers |
| Nov 23, 2020 | Prado Park Lake - Prado Regional Park | Caution | Advisory based on visual and toxins |
| Sep 17, 2020 | Prado Park Lake | Danger | Advisory based on visual and toxins |
| Sep 17, 2020 | Prado Dog Park, Dike Pond | Caution | Advisory based on visual and toxins |
| Sep 17, 2020 | Prado Dog Park, Long Pond SE Corner | Caution | Advisory based on visual and toxins |
| Sep 17, 2020 | Prado Dog Park, "T" Pond Lower Pond, South Corner | Caution | Advisory based on visual and toxins |
| Aug 14, 2020 | Prado Dog Park,Long Pond, North | Caution | Advisory based on visual and toxins |
| Aug 14, 2020 | Prado Dog Park, "T" Pond, 2nd Pond from West Side | Caution | Advisory based on visual and toxins |
| Aug 14, 2020 | Prado Dog Park, Navdha Pond, NE Corner | Caution | Advisory based on visual and toxins |
| Jul 28, 2020 | Prado Recreation Dog Park Ponds | Caution | Advisory based on visual and toxins |
Source
Advisory data: California State Water Resources Control Board, Freshwater Harmful Algal Bloom Program, via data.ca.gov (public domain). Advisories are recommendations; reporting is voluntary and incomplete. The state's data. An advisory ends only when the state records a later "None" (no advisory recommended) at the same spot, or an end date. A blank end date is unknown.