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Gross Reservoir is a reservoir in Colorado. It covers roughly 440 surface acres. If you are planning a trip, Boulder Reservoir, Carter Lake, and Barr Lake are also nearby. The page brings together an hourly and 7-day forecast, wind and gust outlook, and activity scores for boating, paddling, and swimming. Current weather, wind, and activity conditions for Gross Reservoir are updated throughout the day.
Updated
No active alerts for this lake as of the last check (Oct 9, 3:42 AM MDT). Alerts are re-checked automatically; see the official source for updates.
Best good fishing window, averaging 88/100 across these hours. Wind 3 mph from the west-southwest. Measured water temperature 53°F from a representative gauge 4.4 mi away. Provisional data. Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 57° | 57° | 56° | 56° | 56° | 58° | 64° | 72° | 74° | 76° | 77° | 77° | 77° | 75° | 73° | 70° | 65° | 62° | 61° | 60° | 62° | 61° | 61° | 60° |
| Wind (kts) | 5 | 6 | 6 | 6 | 6 | 7 | 6 | 4 | 3 | 3 | 4 | 5 | 5 | 5 | 5 | 5 | 6 | 8 | 10 | 11 | 10 | 11 | 12 | 11 |
| Direction | W | W | W | W | W | W | W | W | W | W | SW | SW | SW | SW | W | W | W | W | W | W | W | W | W | W |
| Gusts (kts) | 8 | 10 | 10 | 10 | 10 | 12 | 11 | 7 | 5 | 5 | 6 | 8 | 8 | 8 | 8 | 8 | 11 | 15 | 18 | 19 | 18 | 19 | 20 | 20 |
| Precip % | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 4% | 4% | 10% | 10% | 10% | 10% | 10% | 10% | 8% | 3% | 0% | 0% | 0% | 0% | 0% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 3 AM MDT | 57°F | 6 mph W (270°) | 9 mph | 0% | 5% | Clear |
| Fri, 4 AM MDT | 57°F | 7 mph W (270°) | 12 mph | 0% | 5% | Clear |
| Fri, 5 AM MDT | 56°F | 7 mph W (270°) | 12 mph | 0% | 4% | Clear |
| Fri, 6 AM MDT | 56°F | 7 mph W (270°) | 12 mph | 0% | 3% | Sunny |
| Fri, 7 AM MDT | 56°F | 7 mph W (270°) | 12 mph | 0% | 5% | Sunny |
| Fri, 8 AM MDT | 58°F | 8 mph W (270°) | 14 mph | 0% | 4% | Sunny |
| Fri, 9 AM MDT | 64°F | 7 mph W (270°) | 13 mph | 0% | 3% | Sunny |
| Fri, 10 AM MDT | 72°F | 5 mph W (270°) | 8 mph | 0% | 3% | Sunny |
| Fri, 11 AM MDT | 74°F | 3 mph W (270°) | 6 mph | 0% | 5% | Sunny |
| Fri, 12 PM MDT | 76°F | 3 mph WSW (248°) | 6 mph | 4% | 15% | Sunny |
| Fri, 1 PM MDT | 77°F | 5 mph SSW (203°) | 7 mph | 4% | 24% | Sunny |
| Fri, 2 PM MDT | 77°F | 6 mph SW (225°) | 9 mph | 10% | 42% | Mostly Sunny |
| Fri, 3 PM MDT | 77°F | 6 mph SW (225°) | 9 mph | 10% | 60% | Partly Sunny |
| Fri, 4 PM MDT | 75°F | 6 mph SSW (203°) | 9 mph | 10% | 61% | Partly Sunny |
| Fri, 5 PM MDT | 73°F | 6 mph WSW (248°) | 9 mph | 10% | 62% | Partly Sunny |
| Fri, 6 PM MDT | 70°F | 6 mph W (270°) | 9 mph | 10% | 63% | Mostly Cloudy |
| Fri, 7 PM MDT | 65°F | 7 mph W (270°) | 13 mph | 10% | 54% | Mostly Cloudy |
| Fri, 8 PM MDT | 62°F | 9 mph W (270°) | 17 mph | 8% | 46% | Partly Cloudy |
| Fri, 9 PM MDT | 61°F | 12 mph W (270°) | 21 mph | 3% | 37% | Partly Cloudy |
| Fri, 10 PM MDT | 60°F | 13 mph W (270°) | 22 mph | 0% | 27% | Partly Cloudy |
| Fri, 11 PM MDT | 62°F | 12 mph W (270°) | 21 mph | 0% | 13% | Mostly Clear |
| Sat, 12 AM MDT | 61°F | 13 mph W (270°) | 22 mph | 0% | 5% | Clear |
| Sat, 1 AM MDT | 61°F | 14 mph WSW (248°) | 23 mph | 0% | 4% | Clear |
| Sat, 2 AM MDT | 60°F | 13 mph W (270°) | 23 mph | 0% | 4% | Clear |
| Sat, 3 AM MDT | 60°F | 12 mph W (270°) | 21 mph | 0% | 6% | Mostly Clear |
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) | 56° | 78° | 56° | 75° | 54° | 71° | 52° | 71° | 48° | 64° | 44° | 59° | 42° | 58° |
| Wind | W 7 mph | WSW 3 to 8 mph | W 6 to 14 mph | WSW 5 to 9 mph | WSW 3 to 8 mph | SSE 2 to 6 mph | WNW 3 mph | ESE 1 to 5 mph | NW 2 mph | NE 0 to 6 mph | WNW 3 mph | W 3 to 14 mph | W 5 to 9 mph | NW 6 mph |
| Gusts | 12 mph | 14 mph | 23 mph | 16 mph | 14 mph | 9 mph | 8 mph | 12 mph | 7 mph | 13 mph | 12 mph | 28 mph | 21 mph | 14 mph |
| Precip % | 0% | 10% | 10% | 11% | 0% | 4% | 6% | 4% | 24% | 33% | 47% | 42% | 34% | 29% |
| Forecast |
No active USGS or USACE telemetry gauge is currently mapped to Gross Reservoir. Not available from a verified source for this lake.
SOUTH BOULDER CR AT FOREBAY NR ELDORADO SPRINGS CO · Oct 9, 9:00 AM UTC
Good for fishing (81/100), from 6 available inputs. Supporting this: Wind 6 mph from the west. Measured water temperature 53°F from a representative gauge 4.4 mi away. Provisional data. Not available from a verified source for this lake: pressure trend. Confidence is moderate (82%) because some inputs are unavailable or older than ideal.
Excellent for boating (96/100), from 4 available inputs. Supporting this: Wind 6 mph from the west. Gusts to 9 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 (88/100), from 4 available inputs. Supporting this: Gusts are within 3 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%).
Fair for kayaking (70/100), from 5 available inputs. Supporting this: Wind 6 mph from the west. Gusts to 9 mph. Water temperature is 53°F (combined air+water: 110°F). Cold shock hazard: sudden immersion below 55°F poses serious risk. Confidence is high (90%).
Surface water measured at 53°F. Cold shock reflex presents an immediate drowning risk.
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Individual boat ramp GPS coordinates are maintained under the jurisdiction of CO Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
In CO, Gross Reservoir stands out as a versatile freshwater reservoir valued for its fishing waters, boating access, and scenic shoreline. Whether embarking on early morning fishing runs or enjoying midday water recreation, visitors find varied opportunities across the basin. Public facilities are overseen by state and local natural resource agencies.
Valid freshwater sport fishing license issued by Colorado Parks and Wildlife (CPW) is required for anglers age 16+. 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 Brook Trout, Largemouth Bass, Brown Trout, Common Carp. 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.
Mild year-round outdoor climate. Uncrowded waters, active winter bass and crappie fishing, and open year-round boat launch access.
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 Gross Reservoir 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, 3:42 AM MDT