Waters · Lakes · CO · Tue, Aug 18

How's the bite at Lake Granby today? On fire — save your energy for the evening.

Drop everything. Go.

Built from solunar, pressure, level, wind. This water has no live gauge for every reading — see the sources below.

8/10
On fire

Today's bite windows

12 AM6 AMNoon6 PM11 PM
Major
4:28 AM–6:28 AM
Moon underfoot
Minor
12:23 PM–1:23 PM
Moonrise
Major
4:51 PM–6:51 PM
Moon overhead
Minor
10:12 PM–11:12 PM
Moonset

Sunrise 6:17 AM · sunset 7:56 PM · tomorrow's first major 5:15 AM–7:15 AM · windows on every water

Solunar · computed updated 2:24 PM

Conditions right now

Water level
8244.88ft
-0.2 ft in 24h
USBR Lake Granby and Dam reading for Aug 17
Pressure
30.43inHg
falling · -2.4 hPa/12h
NOAA KGNB updated 1:55 PM
Wind
9mph W
NOAA KGNB updated 1:55 PM
Moon
37% waxing
Solunar · computed updated 2:24 PM

What this means

Largemouth bass, Crappie, Catfish
This gauge reports level but no water temperature, so depth calls stay open. Read the windows and the pressure trend instead.

Lake Granby water level today

8244.88 ft down 0.20 ft in 24 hours

That sits 0% of the way up the band it has held over the last 9 days, between 8244.88 and 8246.91 ft. Over the week it is down1.53ft.

08-08 8244.88–8246.91 ft 08-17
USBR Lake Granby and Dam reading for Aug 17

The week ahead

Wed 6 Biting
Thu 6 Biting
Fri 7 Biting
Sat 6 Biting
Sun 6 Biting
Mon 6 Biting
Tue 6 Biting

Forecast days carry solunar and the wind outlook. Pressure and gauge movement land the morning of.

Before you go

A CO fishing license covers this water. The state agency sets the rules and is the one that counts.

Nearby waters today

Questions people ask about Lake Granby

Answered from the same readings as the rest of this page. Where we have no basis for an answer, there is no entry — spot-by-spot local knowledge is not something we can claim for Lake Granby.

Is it worth fishing Lake Granby today?
8 out of 10 — on fire. Drop everything. Go. The strongest stretch is 4:28 AM–6:28 AM. That number is worked out fresh each morning from the solunar windows, the pressure trend, the water level.
What time should you fish Lake Granby?
Today's major windows run 4:28 AM–6:28 AM and 4:51 PM–6:51 PM, with minor windows at 12:23 PM–1:23 PM and 10:12 PM–11:12 PM. Sunrise is 6:17 AM and sunset 7:56 PM. A major landing on first or last light is the stretch worth setting an alarm for.
What is the water temperature at Lake Granby?
No gauge on Lake Granby measures water temperature. US reservoir gauges report height, not temperature — so rather than estimate it, this page leaves it out and leans on the windows and the pressure trend instead.
What is the water level at Lake Granby right now?
8244.88 ft, the reading for August 17 from the Lake Granby and Dam gauge run by the USBR, which publishes one value a day. Over 24 hours it is down 0.20 ft.
Can you eat the fish you catch in Lake Granby?
That is a health question, and it is answered officially rather than by us. Colorado Department of Public Health and Environment publishes the fish consumption advisory covering these waters, where a baseline mercury guidance covers every water, with added PFOS advisories at Barr Lake, Runyon Lake and Chatfield Reservoir. Read it before you keep a meal — we give no eating advice.

CDPHE fish consumption advisory

What size fish can you keep in Colorado?
It depends on the species, and several have slot limits rather than a simple minimum. Open to harvest today: trout, arctic char, grayling and mountain whitefish, kokanee salmon, walleye, saugeye and sauger, largemouth, smallmouth and spotted bass. Seasons here change mid-year by agency order, so the status is re-checked every morning.

Trout, Arctic char, grayling and mountain whitefish limits · Kokanee salmon limits · Walleye, saugeye and sauger limits · Largemouth, smallmouth and spotted bass limits · Check a length against the rules

Where these numbers come from

The largest reservoir of the Colorado-Big Thompson project, read at the dam by the Bureau of Reclamation once a day, a day or two after the fact — that is the rhythm of the agency. USGS gauges the Colorado River below the dam and at the town of Granby, but not the lake. No temperature sensor, so the depth calls stay open.

No one types these in by hand. If a source goes quiet, the page says so instead of showing you yesterday.