670 Lakes · 336 Rivers · 64 Counties · 201 TownsColorado state record fish
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Colorado counties

Fishing in Boulder County, Colorado

Seat: Boulder. CPW Northeast Region.

  • 66lake pages
  • 1ramp site
  • 10stream pages
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Photo of Denver: Craig Talbert, CC BY 2.0

Boulder County, Colorado

The short version on Boulder County

Boulder County is run from Boulder, and Colorado Parks and Wildlife manages its fishing through the Northeast Region. The county covers 726 square miles of land and 14.1 of water, home to 330,758 people in 2020.

Count 2,663 acres across 66 lakes with pages, the largest of them Boulder City Reservoir. At 12,066 feet, Dorothy Lake is the high point among the county lake pages. There are 1 ramp site boat ramp sites on the CPW map inside the county. The CPW Fishing Atlas shows 115 fishing locations, 26 of them accessible piers or fishing areas. Hard-water anglers have 5 lake pages flagged for ice fishing.

66lake pages
1ramp sites
10stream pages
115atlas access points

Census 2020 population and 2023 Gazetteer land and water area; CPW Fishing Atlas waterbodies, ramps and fishing locations, retrieved October 2026.

Map

Pins for every Boulder County access point

CPW boat ramps and Fishing Atlas locations; lake pins are CPW waterbody points, stream pins the midpoint of the CPW reach. Checked October 2026.

Lakes

Reservoirs and lakes of Boulder County

LakeAcresElevation ftNotesSpecies listed
Boulder City Reservoir5315,176ice fishing, gas motorsblack crappie, bluegill, channel catfish
Gross Reservoir4217,290no motorsbrook trout, brown trout, cutbow
McIntosh Lake2435,074no motorsblack crappie, bluegill, channel catfish
Button Rock Reservoir2226,403no boats
Barker Reservoir1998,187no boats, trout stocked
Lagerman Reservoir975,087gas motors, trout stockedbluegill, channel catfish, common carp
Left Hand Reservoir9710,650
Waneka Lake495,328no motors, trout stockedblack crappie, bluegill, channel catfish
McCall Lake485,189float tubes, trout stocked
Long Lake, Boulder County4110,526ice fishing, no motorsbrook trout, cutthroat trout
Isabelle Lake3410,873no motorsbrook trout, cutthroat trout
Teller Lake #5335,128no boats
Coot Lake275,174no boats, trout stocked
Erie Lake275,238no boats, trout stocked
Stearns Reservoir275,275no boats
Heron Lake – Pella Crossing275,060no motorsbluegill, channel catfish, crappie
Harper Lake265,609no boats, trout stocked
Blue Lake, Boulder County2311,310no motorscutthroat trout, white bass, wiper
Pit D205,180no motorsblack crappie, channel catfish, common carp
Wonderland Lake205,538no boats
Teller Lake195,204no boats
Golden Gravel Pond #3185,001trout stocked
Jasper Lake1710,819no motorsbrook trout, cutthroat trout
Sunset Lake – Pella Crossing175,069no motorsblack crappie, bluegill, channel catfish
Brainard Lake1610,340ice fishing, no motorsbrook trout, cutthroat trout
Boulder County Fairgrounds Lake164,986
Clearwater Pond – Belly Boat #3165,087no motors, trout stockedblack crappie, bluegill, channel catfish
Diamond Lake Lower1410,945no motorsbrook trout, cutthroat trout, splake
Dorothy Lake1412,066no motorscutthroat trout
Izaak Walton Longmont Pond134,968no boats, trout stocked
Mitchell Lake, Big1310,699ice fishing, no motorsbrook trout, cutthroat trout
Sawhill Pond # 1135,128ice fishing, float tubes
KOA Lake – Boulder125,190float tubes, trout stocked
Golden Gravel Pond #1125,010
Dragonfly Pond – Belly Boat #1125,091no motorsblack crappie, bluegill, channel catfish
Golden Gravel Pond #2125,007
Sawhill Pond # 2125,131float tubes
Walden Pond Southwest125,129no boats
Skyscraper Lake1111,226no motorscutthroat trout, tiger trout, splake
Viele Lake115,498no boats, trout stocked
Thomas Reservoir115,158no boats
Sawhill Pond #10105,148float tubes
Devils Thumb Lake1011,145no motorscutthroat trout, rainbow trout, brown trout
Sawhill Pond # 5105,128float tubes, trout stocked
King Lake1011,436no boatsrainbow trout, brown trout
Sawhill Pond # 495,129float tubes
Neva Lake Upper911,843no motorscutthroat trout
Sawhill Pond # 985,138float tubes
Walden Pond Northwest85,128no boats
Poplar Pond – Belly Boat #275,098no motors, trout stockedbluegill, channel catfish, crappie
Neva Lake Lower711,775no motorscutthroat trout
Red Rock Lake610,157no motorsrainbow trout
Walden Pond South65,127no boats
Woodland Lake610,977no motorscutthroat trout
Storm Lake611,409no motorscutthroat trout
Bob Lake511,575no boats
Betty Lake511,450no motorscutthroat trout, lake trout, rainbow trout
Walden Pond Northeast55,122no boats
Diamond Lake Upper511,726no motorscutthroat trout
Sawhill Pond #1155,138float tubes
  • Sawhill Pond #125 acres
  • Boulder Ponds5 acres
  • Lost Lake, Boulder County5 acres
  • Deep Lake, Boulder County4 acres
  • Sawhill Pond # 34 acres
  • Sawhill Pond #133 acres

CPW Fishing Atlas waterbody outlines (acres from the outline), elevation and boating notes; species from CPW Boatable Waters. Retrieved October 2026.

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More lakes

More ponds and small lakes of Boulder County

39 more named waters in Boulder County have too little published detail for a page, so they appear here with acres and the closest town.

WaterAcresElevation ftNearest town
Terry Lake, Boulder County320Longmont
Ish Lake316Mead
Valmont Reservoir288Valmont
Panama Reservoir Number 1275Leyner
Marshall Lake266Eldorado Springs
Baseline Reservoir, Boulder County258Paragon Estates
Highland Reservoir Number 2163Longmont
Foothills Reservoir156Lyons
Hillcrest Lake121Valmont
Sixmile Reservoir118Valmont
Left Hand Valley Reservoir110Altona
Silver Lake, Boulder County106Ward
Leggett-Owen Reservoir99Valmont
Burch Lake93Lyons
Beaver Reservoir92Hidden Lake
Gaynor Lake59Niwot
Divide Reservoir57Longmont
Clover Basin Reservoir54Niwot
Walden Pond Middle28Gunbarrel
Webster Pond – Pella Crossing12Longmont
Sawhill Pond #635,129Valmont
Yankee Doodle Lake310,716Eldora
Jenny Lake210,922Eldora
Thunderbird Lake25,315Boulder
Rainbow Lake #3210,264Eldora
Sawhill Pond #1525,141Valmont
Morraine Lake110,219Ward
Klubert Warembourg Pond15,388Louisville
Rainbow Lake #2110,181Eldora
Rainbow Lake #1110,151Eldora
Sawhill Pond #1415,138Valmont
Rainbow Lake #4110,264Eldora
Sawhill Pond # 815,129Valmont
Park Lake15,419Louisville
Banana Lake011,348Eldora
Sawhill Pond # 705,128Valmont
Sawhill Pond #1A05,129Valmont
Boulder Kids Pond05,361Boulder
Rainbow Lake #5010,270Eldora

CPW Fishing Atlas waterbodies, retrieved October 2026.

Streams

Rivers and creeks of Boulder County

  • Boulder Creekstream, 1 reach with special rules (4.7 mi); 2 public access properties
  • Cabin Creekstream, 1 public access property
  • Caribou Creekstream, 1 public access property
  • Horseshoe Creekstream, 1 public access property
  • Jasper Creekstream, 1 public access property
  • Left Hand Creekstream, 3 public access properties
  • Middle Saint Vrain Creekstream, 1 public access property
  • North Saint Vrain Creekstream, 1 reach with special rules (2.5 mi); 2 public access properties
  • South Boulder Creekstream, 3 public access properties
  • South Saint Vrain Creekstream, 1 public access property

Gold Medal and special trout water in Boulder County

In Boulder County, 2 streams carry CPW special-regulation reaches and 0 hold Gold Medal miles, where trout density and size meet the CPW standard.

Every Gold Medal reach in the state is on the Gold Medal page.

River flow stations of Boulder County

USGS gaugeLatest readingTime (ET)
Boulder Creek At North 75th St. Near Boulder, Co2 cfs, 3.61 ft gage heightNov 11 6:15 pm
Left Hand Creek At Hover Road Near Longmont, Co3 cfs, 5.62 ft gage heightNov 11 6:10 pm
Coal Creek Near Louisville, Co0 cfs, 1.01 ft gage heightOct 1 1:45 am Not updated since Oct 1, 2005.

US Geological Survey provisional data, retrieved Nov 11, 2026 6:33 pm ET. Provisional readings can be revised.

CPW special-regulation, Gold Medal and Quality Waters stream layers (miles from CPW line geometry); USGS gauges. Retrieved October 2026.

Storage

Acre-feet held in Boulder County reservoirs

15,376 acre-feetstorage, Buttonrock (Ralph Price) Reservoir

Co. Division of Water Resources storage telemetry for Buttonrock (Ralph Price) Reservoir (station BRKDAMCO), recorded October 25, 2026; retrieved October 25, 2026. Provisional data from CDSS.

Access

Boat ramps inside Boulder County

  • Boulder City Reservoir boat rampBoulder City Reservoir, boat ramp, ANS inspection, Other

Atlas fishing spots of Boulder County (115)

CPW boat ramp and Fishing Atlas fishing location layers (ndismaps.nrel.colostate.edu), retrieved October 2026.

Stocking and records

Boulder County trout plantings and record catches

49 report listings since 2024 cover 14 waters of Boulder County.

Stocked lakes and streams of Boulder County

WaterListingsBy yearLatest
McCall Lake102026: 4, 2025: 3, 2024: 3Oct. 16, 2026
Coot Lake32026: 1, 2025: 2Oct. 16, 2026
KOA Lake – Boulder72026: 3, 2025: 2, 2024: 2Oct. 16, 2026
Golden Gravel Pond #362026: 1, 2025: 2, 2024: 3Oct. 2, 2026
Barker Reservoir12026: 1June 19, 2026
Lagerman Reservoir12026: 1June 12, 2026
Waneka Lake52026: 1, 2025: 2, 2024: 2May 8, 2026
Harper Lake32026: 1, 2025: 1, 2024: 1March 20, 2026
Viele Lake32026: 1, 2025: 2March 5, 2026
Izaak Walton Longmont Pond42025: 2, 2024: 2Oct. 10, 2025
Sawhill Pond # 512025: 1April 18, 2025
Poplar Pond – Belly Boat #222025: 1, 2024: 1March 21, 2025
Erie Lake22024: 2Oct. 11, 2024
Clearwater Pond – Belly Boat #312024: 1March 29, 2024

CPW Fish Stocking Report (catchable trout, about 10 inches; each listing is a week the water appeared on the report, 2024 to October 2026); CPW publishes no numbers or sizes per water. Retrieved October 2026. State records from the 2026 Colorado Fishing brochure (CPW, season March 1, 2026 to March 31, 2027).

Regulations

Waters of Boulder County off the statewide chart

The chart below applies across Boulder County in the east slope; named exceptions follow.

SpeciesLimitSeason
Trout, arctic char, grayling, salmon and whitefish (not kokanee)Daily bag 4, possession 8, in aggregateOpen all year, day and night, unless a special regulation says otherwise
Brook trout 8 inches or less (bonus)Daily bag 10, possession 10Open all year, day and night, unless a special regulation says otherwise
Kokanee salmonDaily bag 10, possession 10Open all year, day and night, unless a special regulation says otherwise
Walleye, saugeye and saugerDaily bag 5, possession 5, in aggregateOpen all year, day and night, unless a special regulation says otherwise
Largemouth, smallmouth and spotted bassDaily bag 5, possession 5, in aggregateOpen all year, day and night, unless a special regulation says otherwise
White bass, striped bass and wiperDaily bag 10, possession 10, in aggregateOpen all year, day and night, unless a special regulation says otherwise
Channel, flathead and blue catfishDaily bag 10, possession 10, in aggregateOpen all year, day and night, unless a special regulation says otherwise
White and black crappieDaily bag 20, possession 20, in aggregateOpen all year, day and night, unless a special regulation says otherwise
Bluegill and other sunfishDaily bag 20, possession 20, in aggregateOpen all year, day and night, unless a special regulation says otherwise
Yellow perchDaily bag 20, possession 20Open all year, day and night, unless a special regulation says otherwise
Tiger muskieDaily bag 1, possession 1; at least 36 inches longOpen all year, day and night, unless a special regulation says otherwise
Northern pike and bullheadNo bag or possession limitOpen all year, day and night, unless a special regulation says otherwise

Named Boulder County waters with their own rules (16)

Water and sectionRulesBrochure
Barker ReservoirIce fishing prohibited. Snagging kokanee permitted Oct. 1–Dec. 1.p. 11
From the upper end of Eben Fine Park (within Boulder city limits) downstream to 55th Street:Artificial flies and lures only. Trout must be returned to water immediately.p. 13
Button Rock (Ralph Price) ReservoirArtificial flies and lures only. Bag and possession limit for trout is 2. Fishing prohibited Nov. 1–April 30.p. 14
From the headwaters downstream to the confluence with North Boulder Creek:Fishing prohibited.p. 15
Erie LakeAll largemouth and smallmouth bass must be returned to water immediately.p. 21
On Golden Park Ponds No. 1 and No. 2:Artificial flies and lures only. Scented flies or lures must be 1.5 inches or longer. All largemouth and smallmouth bass must be returned to water immediately. Possession of largemouth or smallmouth bass while fishing Golden Park Ponds No. 1 or 2 is prohibited.p. 23
On Golden Park Pond No. 3:Bag, possession and min. size for largemouth and smallmouth bass is 1 in the aggregate, 15 inches long.p. 23
Gross ReservoirFishing prohibited from sunset to sunrise. Snagging kokanee permitted Oct. 1–Dec. 1.p. 23
KOA LakeAll largemouth and smallmouth bass must be returned to water immediately.p. 26
Pella Crossing Recreation Area Ponds (All Ponds)Artificial flies and lures only. Scented flies or lures must be 1.5 inches or longer. All largemouth and smallmouth bass must be returned to the water immediately. Fishing prohibited in Webster Pond.p. 30
Pit D PondBag, possession and min. size for largemouth and smallmouth bass is 1 in the aggregate, 15 inches long.p. 31
Within the town limits of Lyons, as posted:Artificial flies and lures only. Trout must be returned to water immediately.p. 34
Stearns LakeMin. size for largemouth and smallmouth bass is 15 inches long.p. 37
Thomas ReservoirBag, possession limit and min. size for largemouth and smallmouth bass is 1 in the aggregate, 15 inches long.p. 37
Walden Ponds (except Wally Toevs Pond)Artificial flies and lures only. Scented flies or lures must be 1.5 inches or longer. All largemouth and smallmouth bass must be returned to the water immediately.p. 38
Waneka Lake (Lafayette)Min. size for largemouth and smallmouth bass is 15 inches long.p. 39

Special regulations as printed in the 2026 Colorado Fishing brochure (CPW, season March 1, 2026 to March 31, 2027), pp. 11 to 39, checked against CPW Chapter W-1 (as approved 13 November 2025); retrieved October 2026.

Colorado license and rules
Local help

Tackle, flies and guides in Boulder County

Boulder County shops that sell fishing gear

  • Angler's Productsfly shop, Boulder
  • Fish Creek Spinnersbait and tackle shop, Superior
  • Fly shopfly shop, Boulder
  • Front Range Anglersfly shop, Boulder
  • Laughing Grizzly Fly Shopfly shop, Longmont
  • Lyons Anglerfly shop, Lyons
  • Rise Form Fliesbait and tackle shop, Boulder
  • Rocky Mountain Anglersfly shop, Boulder
  • Stoney River Outfittersbait and tackle shop, Boulder
  • Woods and Water Outfittersbait and tackle shop, Longmont
  • Yakoda Supplybait and tackle shop, Louisville
  • Angles Sportssporting goods store, Longmont

DORA-registered fishing guides of Boulder County

  • Arbor Anglersfishing guide, Lafayette, (303) 562-7202
  • Front Range Anglersfishing guide, Boulder, (303) 494-1375
  • Flatirons Fly Shop, Inc.fly fishing guide, Boulder
  • Laughing Grizzly Fly Shop, Inc.fly fishing guide, Longmont

Yellow Pages listings and chain store locators; DORA Office of Outfitters Registration roster (active business registrations with a fishing word in the name, placed by business city). Retrieved October 2026.

Nearby

Close to Boulder County

Bases for trips in Boulder County

  • Boulderpop. 108,250
  • Longmontpop. 98,885
  • Lafayettepop. 30,411
  • Louisvillepop. 21,226
  • Superiorpop. 13,094
  • Gunbarrelpop. 9,554
  • Niwotpop. 4,306
  • Lyonspop. 2,209
  • Nederlandpop. 1,471

Neighbors of Boulder County

  • Gilpin County18 miles southwest
  • Broomfield County21 miles southeast
  • Clear Creek County32 miles southwest
  • Denver County36 miles southeast
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In photos

Photo views of fishing water near Boulder County

Denver County, Colorado
Denver County 27 mi
Photo: Sergio Vassio, CC BY 2.0
Standley Lake, Colorado
Standley Lake 13 mi
Photo: Akijione, CC BY-SA 3.0
Gross Reservoir, Colorado
Gross Reservoir 8.3 mi
Photo: SOTMUS, CC BY-SA 4.0
Carter Reservoir, Colorado
Carter Reservoir 21 mi
Photo: KimonBerlin, CC BY-SA 2.0
Hunting

Hunting in Boulder County

Public hunting land, seasons and processors for Boulder County are on State Hunting Spots, our sister site.

Boulder County hunting
Answers

Boulder County fishing, explained briefly

How many CPW-mapped ramps sit inside Boulder County?

1 ramp site appear on the CPW map for the county.

Where is the biggest still water in Boulder County?

Boulder City Reservoir, about 531 acres by its CPW outline.

Where is the Gold Medal water near Boulder County?

No Gold Medal reach or lake lies in the county; the statewide list is on the Gold Medal page.

Are there closed seasons in Boulder County?

Yes, all year and at night, unless the water has its own closure in the brochure.

Which Boulder County stores sell fishing gear?

12 listings, Angler's Products first.

Can I hire a fishing outfitter in Boulder County?

There are 4 guide businesses registered in the county.

Which CPW region covers Boulder County?

It is in the Northeast Region.

Where do Boulder County commissioners meet?

The seat is Boulder.

What would an out-of-state angler spend to fish Boulder County?

Colorado charges adult residents $44.87 for the annual fishing license and nonresidents $124.01; residents 64 and older pay $12.96. One-day licenses sell at $18.07 (resident) and $21.90 (nonresident). A $14.24 stamp lets a licensed angler run a second rod.

Do any Boulder County waters have special regulations?

The brochure prints 16 special regulation entries for the county, starting with Barker Reservoir; all are in the regulations table above.

Does CPW stock trout in Boulder County?

Yes; 14 Boulder County waters appeared on the catchable trout report since 2024, 49 times in all.

Fish Boulder County this year

Ramp pages carry directions and CPW notes.

All Colorado countiesLicense and rules