Johnstown Reservoir fishing
Johnstown Reservoir
What's biting at Johnstown Reservoir
Species commonly reported here -- tap any card for techniques, target seasons, and other waters where it's been caught.
Plan your trip down to the hour
Same weather feed Snoflo's iOS app uses -- updated continuously from NOAA / yr.no.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max so trends jump out at a glance.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks. Hover any point for the full breakdown.
Nearby streamflow
USGS streamgauges within reach of Johnstown Reservoir -- updated continuously from the National Water Information System.
| Streamgauge | Discharge | View |
|---|---|---|
| Big Thompson River At Loveland | 73 cfs | → |
| St. Vrain Creek At Mouth | 103 cfs | → |
| Big Thompson River At Mouth | 38 cfs | → |
| St Vrain Cr Blw Boulder Cr At Hwy 119 Nr Longmont | 71 cfs | → |
| St. Vrain Creek Below Longmont | -999,999 cfs | → |
| Boulder Creek At Mouth | 4 cfs | → |
Plan a longer trip
The closest campgrounds, parks, boat launches, and reservoirs so a fishing run can grow into a weekend.
Campgrounds
- Boyd Lake State Park
- Missile Site Park
- Union Reservoir
- St. Vrain State Park
- Carter Lake - South Side Campgrounds
- Carter Lake - North Side Campgrounds
Parks
Reservoirs
Angling safety & ethics
- Know the regulations
- Check local fishing rules, seasons, size limits, and license requirements to ensure legal and sustainable angling.
- Handle fish responsibly
- Use wet hands, minimize air exposure, and release fish gently to improve survival rates when practicing catch-and-release.
- Choose the right gear
- Match your rod, line, and tackle to the species and conditions to increase success and reduce unnecessary harm to fish.
- Respect the waterway
- Avoid disturbing habitat, prevent bank erosion, and keep a safe distance from spawning areas to protect ecosystems.
- Keep it clean
- Pack out all line, hooks, bait containers, and trash. Discarded gear can injure wildlife and degrade waterways.
Set push alerts in the Snoflo app
Save Johnstown Reservoir as a favorite, set a custom threshold (water temperature, streamflow, snowpack), and the iOS app will push the moment conditions cross.
About Johnstown Reservoir
What fish species are found at Johnstown Reservoir?
Snoflo tracks the species commonly reported at Johnstown Reservoir -- see the Fish Species panel above for the live list with images and links to per-species pages.
How fresh is the weather data on this page?
The hourly forecast updates throughout the day from the NOAA / yr.no public feeds. Streamflow data comes live from USGS streamgauges, also refreshed continuously.
Can I get alerts when conditions change?
Yes -- alerts are managed through the Snoflo iOS app. Favorite this area, set a threshold (water temperature, streamflow, snowpack), and you'll get a push the moment it crosses.
Do I need a fishing license?
Yes. Check your state agency's regulations for license requirements, seasons, size limits, and any waterbody-specific rules before fishing Johnstown Reservoir.
How do I get to Johnstown Reservoir?
Tap Open in map in the hero above to center the Snoflo interactive map on this area, or grab the coordinates from the location facts panel.
Other angling spots near here
Snoflo-tracked fishing areas within driving distance of Johnstown Reservoir.