WadeNot recommended
This report does not recommend wading on this reach.
All Colorado reports
Fly fishing report · West
South Boulder Creek Below Gross Reservoir
Is South Boulder Creek Below Gross Reservoir worth the trip today? Check flow, weather, hatches, access, and rules for Colorado before you go.
See the flow chart ↓Photo: Jeffrey Beall Opens in a new tab. · CC BY 3.0
Good day to fish?Latest river check
Caution
Maybe. Read the cautions first.
46
If you go: Bank / edge. Bank and edge fishing remains a practical low-commitment option if access is legal and footing is safe.
Update time and confidence
Live data checkMediumHow much of the live flow, weather, and alert data came back.
Today's callLowNo structured live flow
Score calculated Aug 29, 2026, 8:23 PM MDTSources checked often
Lowest-risk access methodBank / edge
These scores compare the risks of wading, bank fishing, and floating.
Bank / edge · Lowest risk39/100
Bank and edge fishing remains a practical low-commitment option if access is legal and footing is safe.
FloatNot recommended
This report does not recommend floating this reach.
Restrictions and advisories
Check South Boulder Creek Below Gross Reservoir before fishing.
These notices match this river report. No notice here does not mean the river is open. Always check the agency before you fish.
Status not clear — check nowOfficial restrictionAccess restriction
Denver Water summer 2026 Gross Reservoir access update
- Area
- Gross Reservoir outlet trails and approaches only
- Link checked
- Link status
- Check the agency now
- Check again by
What to know about this notice
Construction and posted access changes do not describe Walker Ranch or Eldorado Canyon status.
The source covers the named reservoir approaches. Without clear start and end times, the river page asks anglers to check the agency before leaving.
Your plan
Today's South Boulder Creek Below Gross Reservoir plan.
South Boulder Creek can look ideal on a chart while the trail you planned to use is closed, construction has changed the approach, or the downstream park requires a reservation. A useful decision therefore pairs the below-Gross flow trend with the exact land manager for the section you intend to fish.
- Check first
- Use BOCBGRCO for below-dam trend context. Do not substitute Boulder Creek or a historic USGS station.
- Try
- Choose Gross outlet, Walker Ranch, or Eldorado Canyon before checking flow so the access source matches the plan.
- Leave when
- Skip for official closure, outlet construction, lightning, flood warning, rapid release change, blocked parking, or an approach you cannot complete safely.
Live river check
What the river is doing
Check the latest flow and weather before you go. A quick change can make the river harder or less safe to fish.
Showing server-checked river conditions while current readings refresh.
- Flow
- —
- Live flow is not available here.
- Air now
- 65°F
Current NWS forecast period
- Next 24h high
- 77.0°F
NWS air forecast near
- Rain chance
- 29%
For this forecast period
This is an air forecast, not a river-temperature reading. Check the water with a stream thermometer before fishing in hot weather.
Latest stored weather check
Chance Showers And Thunderstorms
Chance Showers And Thunderstorms
- Wind
- 8 mph
- Weather checked
RiverReports chart
Recent flow
RiverReports gauge
BlueStreamFly cannot read the latest value from this image. Check the chart on RiverReports Opens in a new tab.
More forecast and source details
National Weather Service
South Boulder Creek below Gross Dam
The National Weather Service forecast is temporarily unavailable.
Live data
Where these readings come from
RiverReports gauge: South Boulder Creek below Gross Reservoir
How to fish it
How to fish South Boulder Creek Below Gross Reservoir today.
The cleanest plan has a fresh stable DWR trend, an explicitly open access route, no severe weather, and enough daylight for the hike out. Unknown flow or closure status should suppress flow-dependent tactics rather than produce a confident recommendation. Gross Reservoir and Walker Ranch are bank-fishing sections because their land managers prohibit wading.
Stable release
From legal bank-fishing sections, work pockets and seams with a short dry-dropper or compact nymph rig.
Rising or rapidly changing
Stay out of the water and wait for the new level to settle.
Low clear water
Approach from downstream, shorten the cast, and reduce fly and tippet profile.
Storm or official closure
Leave the canyon or do not enter. A fishability score cannot override the alert.
Fishing words used on this page
- U.S. Geological Survey (USGS) gauge
- A USGS gauge is an official river station that measures flow or water height.
- Cubic feet per second (cfs)
- Cubic feet per second, or cfs, shows how much water passes the gauge each second.
- Nymph
- A nymph is a young water insect. Anglers also use the word for a fly that copies it.
- Seam
- A seam is the line where fast and slow water meet.
- Blue-winged olive (BWO)
- Blue-winged olives, or BWOs, are small mayflies that often hatch in cool or cloudy weather.
- Caddis
- Caddis are small water insects. The adults look a little like tiny moths.
- Dry-dropper
- A dry-dropper rig has a floating fly with an underwater fly tied below it.
- Emerger
- An emerger copies an insect as it rises from below the water toward the surface.
- Indicator
- An indicator is a small floating marker that can show when a fish takes an underwater fly.
- Midge
- Midges are tiny flies and a common trout food, especially in cold water.
Why this call
Why this score
Best mode nowHurts
Bank / edge: Bank and edge fishing remains a practical low-commitment option if access is legal and footing is safe.
FlowUse caution
RiverReports is linked for the flow chart, but this page does not have a structured live flow value the score can read automatically. Treat the rating as conservative and open the chart before committing.
Short-term weatherUse caution
The forecast has storm or heavy-precipitation risk, so timing and access matter more than the score alone.
Local scoring depthUse caution
This page is using baseline river-specific guidance while deeper local scoring is still being reviewed. Use the live sources and local checks before relying on the rating.
SeasonHelps
Summer: Caddis, mayflies, and terrestrials can matter; start early and watch lightning.
Trip notes
Trip notes
Check these before you choose a reach.
Favor a fresh, stable BOCBGRCO trend that leaves fishable pockets and visibly safe entries. No universal cfs promise replaces a local inspection.
Skip for official closure, outlet construction, lightning, flood warning, rapid release change, blocked parking, or an approach you cannot complete safely.
Select one land manager, verify that route, check the below-dam trend, and fish a compact section with a firm turnaround time.
Use Boulder Creek, North St. Vrain, or another verified Front Range reach when construction, reservations, or releases defeat this plan.
What to try
South Boulder Creek Below Gross Reservoir flies through the year.
Match the time of year, then let rising fish and current speed guide the next change.
SeasonWhat to look forFlies to try
Winter to early spring
What to look forSeasonal planning context only — Midges and short blue-winged olive windows
Flies to try
Also try black beauty
Late spring to early summer
What to look forSeasonal planning context only — BWOs, caddis, PMDs, and seasonal stonefly activity
Mid- to late summerCurrent
What to look forSeasonal planning context only — PMDs, caddis, tricos, ants, beetles, and hoppers
Flies to try
Also try trico spinner, hopper-dropper
Fall
What to look forSeasonal planning context only — BWOs, midges, and baitfish or sculpin movement
Each fly name opens its matching Fly Box guide.
Access and safety
South Boulder Creek Below Gross Reservoir access and rules.
Use these places as starting points. Open the access link below and check posted signs before you park or enter. Colorado statewide fishing rules and posted land-manager restrictions control. No below-Gross special-water entry was verified in the current Chapter 1 review, so this page does not borrow Boulder Creek's city-specific rules. Recheck the current rule and posted site notices before fishing.
Gross Reservoir outlet area
Check Denver Water's current recreation and construction updates. Treat the outlet trail as bank-access and observation context only. Body contact and wading are prohibited, and approaches can close intermittently.
Walker Ranch Open Space
Boulder County provides official trail and fishing information. Fish from legal banks because county open-space rules prohibit wading. The approach can be strenuous and public water is not continuous beyond mapped land.
Eldorado Canyon State Park
Official creek access with park-pass and seasonal vehicle-reservation requirements. No public parking is available in the town of Eldorado Springs.
Check Denver Water's current construction page on every Gross-area trip through the active project period.
Denver Water prohibits body contact, including wading, at Gross Reservoir property. Boulder County also prohibits swimming and wading at Walker Ranch. Plan bank fishing in both sections.
Eldorado Canyon requires vehicle reservations on summer weekends and holidays during the posted season. Confirm current dates before arrival.
Do not assume the entire area between named public properties is open bank access.
River sources
Official South Boulder Creek Below Gross Reservoir sources.
Official agencies and primary river operators come first. Secondary tools are labeled so you know what carries the most weight.
How this report was checked
How this report was checked
Reviewed byBlueStreamFly River Review Team
Trip guidance checked
What was checked: This restored report is maintained from official flow, regulation, access, weather, and public-land sources. Planning guidance is separated from live observations and legal rules.
Live measurements and forecasts keep their provider timestamps. Rules, access, and trip guidance use the source-review date shown here. BlueStreamFly planning advice is editorial interpretation, not an agency notice.
First-hand experience: BlueStreamFly does not claim a first-hand visit or local field test for this report unless a real contributor is explicitly named and linked.
Rules and closures
Check what is allowed, where the rule applies, and whether the river is open.
Flow and weather
Check the latest river reading and forecast before you leave.
Access and land
Check public entry points, land rules, and seasonal access changes.
More helpful links
Use these links for stocking, safety, and other local details.
See all 13 checked sources
Rules and closures
Check what is allowed, where the rule applies, and whether the river is open.
What this source covers
Open the current rules and check the river section, season, and special limits.
What this source covers
Open the current rules and check the river section, season, and special limits.
What this source covers
Open this notice to check its current status, dates, and affected river section.
Applies to: Gross Reservoir outlet trails and approaches only
Construction and posted access changes do not describe Walker Ranch or Eldorado Canyon status.
Flow and weather
Check the latest river reading and forecast before you leave.
What this source covers
Open this river reading to check the latest level, flow, and update time.
What this source covers
Open this river reading to check the latest level, flow, and update time.
What this source covers
Open this page and check the latest safety advice before your trip.
What this source covers
Open this river reading to check the latest level, flow, and update time.
Access and land
Check public entry points, land rules, and seasonal access changes.
What this source covers
Open the land or access page, then check signs before you park or enter.
What this source covers
Open the land or access page, then check signs before you park or enter.
What this source covers
Open the land or access page, then check signs before you park or enter.
What this source covers
Open the land or access page, then check signs before you park or enter.
More helpful links
Use these links for stocking, safety, and other local details.
What this source covers
Open this page for stocking or fish population information.
What this source covers
Open this page for more river information and check when it was last updated.
Quick answers
Quick South Boulder Creek Below Gross Reservoir answers.
What water does this South Boulder Creek below Gross Reservoir report cover?
The below-dam creek through verified public segments at Gross, Walker Ranch, and Eldorado Canyon. It does not imply continuous public access between them.
What should I check first before fishing South Boulder Creek below Gross Reservoir?
Check BOCBGRCO, Denver Water construction, the specific park or open-space status, Colorado rules, and NWS alerts.
Is access straightforward on South Boulder Creek below Gross Reservoir?
Public access exists in named properties, but construction, reservations, parking, trail conditions, and private gaps make route-specific planning essential.
Does the fishability score replace local judgment?
No. Use it as a starting decision, then confirm the source timestamp, official rules, alerts, water temperature, visibility, and conditions at the access you actually plan to use.