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Harrison Slough sits in Idaho and is classified as a lake. The water surface spans about 450 acres, making it a modest body of water. Fish documented in the area include Smallmouth Bass, Bluegill, Largemouth Bass, and Yellow Perch. Sitting at around 2,129 feet of elevation, it drops to a maximum depth near 35 feet. The page brings together an hourly and 7-day forecast, wind and gust outlook, water readings, fishing conditions, and activity scores for boating, paddling, and swimming. If you are planning a trip, Lake Coeur d'Alene and Hayden Lake are also nearby. Water data on this page comes from a mapped monitoring station near the lake. Current weather, wind, and activity conditions for Harrison Slough are updated throughout the day.
Updated
No active alerts for this lake as of the last check (Oct 9, 1:52 AM PDT). Alerts are re-checked automatically; see the official source for updates.
Overall Good (89/100) across 4 activities. Best right now: Boating (98/100).
How the score is calculated →Best excellent fishing window, averaging 90/100 across these hours. Wind 8 mph from the southeast. Dawn hours (06:00 local). Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 53° | 52° | 52° | 50° | 50° | 49° | 49° | 50° | 54° | 58° | 60° | 62° | 64° | 63° | 62° | 61° | 59° | 58° | 57° | 57° | 54° | 52° | 50° | 48° |
| Wind (kts) | 3 | 3 | 3 | 3 | 7 | 7 | 7 | 9 | 10 | 11 | 14 | 14 | 15 | 15 | 14 | 15 | 13 | 11 | 10 | 9 | 9 | 9 | 6 | 6 |
| Direction | SE | SE | SE | SE | SE | SE | SE | S | S | S | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW |
| Gusts (kts) | 4 | 5 | 5 | 5 | 10 | 11 | 12 | 14 | 16 | 17 | 20 | 21 | 22 | 22 | 21 | 21 | 20 | 19 | 18 | 15 | 15 | 15 | 10 | 10 |
| Precip % | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 16% | 16% | 16% | 16% | 16% | 16% | 16% | 16% | 16% | 16% | 16% | 16% | 0% | 0% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 1 AM PDT | 53°F | 3 mph SE (135°) | 5 mph | 0% | 72% | Mostly Cloudy |
| Fri, 2 AM PDT | 52°F | 3 mph SE (135°) | 6 mph | 0% | 66% | Mostly Cloudy |
| Fri, 3 AM PDT | 52°F | 3 mph SE (135°) | 6 mph | 0% | 66% | Mostly Cloudy |
| Fri, 4 AM PDT | 50°F | 3 mph SE (135°) | 6 mph | 0% | 46% | Partly Cloudy |
| Fri, 5 AM PDT | 50°F | 8 mph SE (135°) | 12 mph | 0% | 40% | Partly Cloudy |
| Fri, 6 AM PDT | 49°F | 8 mph SE (135°) | 13 mph | 0% | 40% | Mostly Sunny |
| Fri, 7 AM PDT | 49°F | 8 mph SE (135°) | 14 mph | 0% | 54% | Partly Sunny |
| Fri, 8 AM PDT | 50°F | 10 mph S (180°) | 16 mph | 0% | 55% | Partly Sunny |
| Fri, 9 AM PDT | 54°F | 12 mph S (180°) | 18 mph | 0% | 48% | Mostly Sunny |
| Fri, 10 AM PDT | 58°F | 13 mph S (180°) | 20 mph | 0% | 42% | Mostly Sunny |
| Fri, 11 AM PDT | 60°F | 16 mph SW (225°) | 23 mph | 16% | 42% | Slight Chance Rain Showers |
| Fri, 12 PM PDT | 62°F | 16 mph SW (225°) | 24 mph | 16% | 59% | Slight Chance Rain Showers |
| Fri, 1 PM PDT | 64°F | 17 mph SW (225°) | 25 mph | 16% | 56% | Slight Chance Rain Showers |
| Fri, 2 PM PDT | 63°F | 17 mph SW (225°) | 25 mph | 16% | 81% | Slight Chance Rain Showers |
| Fri, 3 PM PDT | 62°F | 16 mph SW (225°) | 24 mph | 16% | 90% | Slight Chance Rain Showers |
| Fri, 4 PM PDT | 61°F | 17 mph SW (225°) | 24 mph | 16% | 80% | Slight Chance Rain Showers |
| Fri, 5 PM PDT | 59°F | 15 mph SW (225°) | 23 mph | 16% | 76% | Slight Chance Rain Showers |
| Fri, 6 PM PDT | 58°F | 13 mph SW (225°) | 22 mph | 16% | 73% | Slight Chance Rain Showers |
| Fri, 7 PM PDT | 57°F | 12 mph SW (225°) | 21 mph | 16% | 74% | Slight Chance Rain Showers |
| Fri, 8 PM PDT | 57°F | 10 mph SW (225°) | 17 mph | 16% | 59% | Slight Chance Rain Showers |
| Fri, 9 PM PDT | 54°F | 10 mph SW (225°) | 17 mph | 16% | 49% | Slight Chance Rain Showers |
| Fri, 10 PM PDT | 52°F | 10 mph SW (225°) | 17 mph | 16% | 40% | Slight Chance Rain Showers |
| Fri, 11 PM PDT | 50°F | 7 mph SW (225°) | 12 mph | 0% | 45% | Partly Cloudy |
| Sat, 12 AM PDT | 48°F | 7 mph SW (225°) | 12 mph | 0% | 31% | Partly Cloudy |
| Sat, 1 AM PDT | 47°F | 7 mph SW (225°) | 12 mph | 0% | 40% | Partly Cloudy |
Official National Weather Service hourly forecast. Showing 10 of 25 hours. Wind arrows point the way the wind is blowing; the compass point and degrees show where it comes from.
| Period | Overnight October 9, 2026 | Friday October 9, 2026 | Friday Night October 9, 2026 | Saturday October 10, 2026 | Saturday Night October 10, 2026 | Sunday October 11, 2026 | Sunday Night October 11, 2026 | Columbus Day October 12, 2026 | Monday Night October 12, 2026 | Tuesday October 13, 2026 | Tuesday Night October 13, 2026 | Wednesday October 14, 2026 | Wednesday Night October 14, 2026 | Thursday October 15, 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 48° | 66° | 39° | 55° | 38° | 51° | 34° | 55° | 34° | 58° | 38° | 57° | 39° | 60° |
| Wind | SE 3 to 8 mph | S 8 to 17 mph | SW 5 to 13 mph | SW 5 mph | NE 5 to 10 mph | NE 7 to 10 mph | NE 2 to 7 mph | N 2 mph | S 2 mph | SW 3 mph | S 2 mph | SW 3 mph | N 2 mph | NE 2 mph |
| Gusts | 12 mph | 25 mph | 22 mph | 15 mph | 25 mph | 20 mph | 21 mph | 8 mph | 6 mph | 9 mph | 8 mph | 10 mph | 8 mph | 7 mph |
| Precip % | 0% | 16% | 16% | 12% | 24% | 3% | 3% | 3% | 1% | 8% | 38% | 38% | 16% | 4% |
| Forecast |
Good for fishing (84/100), from 5 available inputs. Supporting this: Wind 3 mph from the southeast. 0% chance of precipitation. Not available from a verified source for this lake: pressure trend, water temperature. Confidence is moderate (74%) because some inputs are unavailable or older than ideal.
Excellent for boating (98/100), from 4 available inputs. Supporting this: Wind 3 mph from the southeast. Gusts to 5 mph. Not available from a verified source for this lake: visibility and conditions, verified water access. Confidence is moderate (84%) because some inputs are unavailable or older than ideal.
Good for sailing (75/100), from 4 available inputs. Supporting this: Gusts are within 2 mph of sustained wind, so the breeze is steady. No active official alerts for this lake. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Excellent for kayaking (97/100), from 5 available inputs. Supporting this: Wind 3 mph from the southeast. Gusts to 5 mph. Confidence is high (90%).
Water temperature is not available from a verified source for this lake. No swimming score is shown without it.
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Individual boat ramp GPS coordinates are maintained under the jurisdiction of ID Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
Harrison Slough provides vital open-water recreation for visitors across ID, offering public boat ramps and scenic shoreline amenities. Anglers target an assortment of freshwater species while pleasure boaters cruise its open basins. Facility operations and resource conservation are overseen by state and local natural resource agencies.
Valid freshwater sport fishing license issued by Idaho Department of Fish and Game (IDFG) is required for anglers age 14+. Digital license on mobile is accepted.
Mandatory Clean, Drain & Dry inspection. Out-of-area craft require on-site Aquatic Invasive Species (AIS Quagga/Zebra) inspection or decontamination before launch. USCG life jackets required for all.
Public shoreline and boating access managed by State & Local Authorities. Verify seasonal gate hours, launch fees, and parking rules before travel.
Low-wake cruising, electric-troll fishing craft, and quiet-water exploration. Target gamefish include Smallmouth Bass, Bluegill, Largemouth Bass, Yellow Perch. Morning hours typically provide optimal glassy conditions for kayak and stand-up paddleboard (SUP) touring.
Warm water temperatures, peak swimming, active watersports, and open full-service campgrounds. Highest weekly attendance; plan early arrivals on summer weekends.
Spring pre-spawn and fall feeding transitions create prime trophy angling conditions. Cooler air, lower boat traffic, and vibrant seasonal shoreline foliage.
Northern cold winter conditions with freezing air temperatures and potential surface ice formation. Ramps and water systems may be winterized. Confirm open status before visiting.
No external source rows are cited by the data currently shown on this page.
Updated
Scores are heuristics, not safety guarantees. LakeRadar scores summarize available conditions and are not a substitute for official warnings, local rules, or on-water judgment.
All telemetry for Harrison Slough is synchronized directly from authorized federal and state monitoring networks (USGS, NWS, NOAA, and state environmental authorities). Observations are strictly instrumented readings — unmonitored sensors are transparently disclosed rather than synthetic estimates.
Last source audit: Oct 9, 1:52 AM PDT