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Shaded-relief map of Eureka, Montana: rivers, roads, the city limits and where the water drains.
MONTANA · LINCOLN COUNTY

Eureka

1,561 people, 2,650 ft above sea level in Lincoln County.

2,650 ftElevation, city center
1,561People, 2024 estimate
1 sq miLand area
Sunny 34°
Sunny now Dew point 33° · Calm · high 44°
City of Eureka River Interstate 2 miles
Explore the plate Order a print

The Eureka plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.

MILE1
TODAY

Today in Eureka

NWS forecast and National Blend of Models · updated 1:00 PM MST
RIGHT NOW Glacier Park International Airport (KGPI) · 12:55 PM
Sunny
34° Sunny Feels like 34° · high of 44° near 4 PM
WindCalmno gusts
Humidity96%falling to 82% this afternoon
Pressure29.82 in →steady
Visibility4 mihazy
CloudsClear
UV index—no forecast
Dew point 33° · Dryabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Mostly cloudy
Tomorrow, about 6 PMin about 28 hours · 44% chance · rain
LIKELY AMOUNT0–0.1 inmost likely 0.06; 1 in 10 over 0.2
LAST RAINNov. 100.9 in · 4 dry days
ALERTS & OUTLOOKS
No watches or warnings for Lincoln County
NWS Missoula and the Storm Prediction Center · checked 1:46 PM
SUN & MOON
↑ 7:47 AM5:01 PM ↓
9 h 13 m of daylight, 3 minutes less than yesterday
Waxing crescent, 25% lit. Next full moon: Nov. 24.
AIR & POLLEN
32
GOODAir quality index · fine particles
No pollen source yet.

The next three days, hour by hour

Sky: clear, cloudy, night Rain likely National Blend of Models
SATURDAY, NOV. 14
SUNDAY, NOV. 15
MONDAY, NOV. 16
TUESDAY, NOV. 17
1p
4p
7p
10p
1a
4a
7a
10a
1p
4p
7p
10p
1a
4a
7a
10a
1p
4p
7p
10p
1a
4a
7a
10a
mostly cloudy day
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy night
mostly clear night
mostly sunny
partly cloudy day
partly cloudy day
mostly cloudy night
rain
rain
rain
rain
mostly cloudy day
mostly cloudy day
mostly cloudy day
mostly cloudy night
mostly cloudy night
mostly cloudy night
mostly cloudy night
mostly cloudy night
mostly cloudy day
mostly cloudy day
TEMPERATURE °F
42°
33°
45°
37°
41°
33°
CHANCE OF RAIN
44% · 0.00 in Sunday evening 50%
WIND, MPH
3
3
5
3
3
3
3
3
3
3
3
3
3
2
2
2
1
1
2
1
1
1
1
1
HOW IT FEELS · DEW POINT
Dry: dew points 33 to 41°

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 80° / 62°
SAT Nov. 14 Mostly cloudy Mostly cloudy
44° 33°
0% rain — SSE 3 A
SUN Nov. 15 Chance of showers Chance of showers
48° 36°
40% rain up to 0.1″ SSE 3 B
MON Nov. 16 Chance of showers Chance of showers
44° 31°
30% rain up to 0.07″ S 2 B
TUE Nov. 17 Partly cloudy Partly cloudy
39° 27°
20% rain — WNW 1 B
WED Nov. 18 Mostly cloudy Mostly cloudy
37° 27°
10% rain — NE 1 B
THU Nov. 19 Mostly cloudy Mostly cloudy
38° 27°
20% rain — NNW 5 B
FRI Nov. 20 Partly cloudy Partly cloudy
37° 26°
20% rain — SW 1 B
How sure are we? AModels agree: highs within 4° BSome spread: within 8° CWide spread: check back
Range from the National Blend of Models percentiles · graded on Forecast Scores
AIR MAIL

Where today’s air came from

The air arriving over Eureka about 5,000 feet above the ground was over the Pacific north of Hawaii three days ago, and over British Columbia a day ago, about 1,430 miles back along its path. It came down from about 12,600 feet up, warming and drying as it sank. Near the ground the air came from British Columbia; at 10,000 feet, from the Pacific north of Hawaii. It feels dry all the same. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

MILE2
THE GROUND

What Eureka stands on

Eureka’s center stands about 2,650 ft above sea level. Within three miles the land runs from 2,540 ft to 3,210 ft, a difference of 670 ft: hilly country. The highest named summit within 15 miles is Poorman Mountain, about 7,780 ft, 9 miles northeast.

Under the town center the state geologic map shows Lower Missoula Group: Shepard and Snowslip Formations; or Shepard Formation and unresolved Snowslip Formation equivalent (metasiltstone, argillite), from the Mesoproterozoic, 1 to 1.6 billion years old.

The section below crosses 5 rock units mapped at the surface.

Eureka, cut in half from southwest to northeast

A section southwest to northeast, 24 miles through the town center
2,000 ft4,000 ft6,000 ft EUREKA2,650 ftGreen Mountain7,760 ft ← SWNE →

Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.

Rock at the surface along the line

Piegan Group: Helena and Wallace Formations

Quartzite, metasiltstone, argillite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 10 mi of the line.

Ravalli Group: St. Regis, Revett, and Burke Formations; or Empire and Grinnell Formations; or Empire and Spokane Formations

Quartzite, argillite, metasiltstone. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 6 mi of the line.

Glacial deposit

Unconsolidated. Age: Pleistocene to Holocene, less than 1.8 million years old. About 4 mi of the line.

Lower Missoula Group: Shepard and Snowslip Formations; or Shepard Formation and unresolved Snowslip Formation equivalent

Metasiltstone, argillite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.

Purcell Lava

Basalt. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.

From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.

Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
MILE3
THE WATER

Where Eureka’s rain goes

A raindrop that lands in Eureka reaches the Pacific Ocean by way of Sinclair Creek, the Tobacco, the Kootenai and the Columbia: about 900 river miles.

THE WAY DOWN, TO SCALE
Eureka≈ 900 mi · the Pacific Ocean
FROM THE CENTER OF EUREKA ≈ 900 mi to the Pacific Ocean Sinclair Creek → Tobacco → Kootenai → Columbia

Lake on the way: Lake Umatilla.

460 miles of the trip are on the Columbia.

Traced down the USGS NHDPlus V2.1 river network from the Census center point of Eureka; river miles along the main stem, rounded.

MILE7
ON THE NETWORK

Around Eureka on the Forecast Network

Neighboring plates

Coeur d'Alene ID · 114 MI 114 miles southwest Missoula MT · 146 MI 146 miles south Great Falls MT · 197 MI 197 miles southeast
FORECASTCITY
Map of Eureka, Montana. Explore the plate
MONTANA · LINCOLN

Eureka

1,561 people, 2,650 ft above sea level in Lincoln County.

2,650 ftElevation
1,561People
1 sq miLand
Sunny 34°
SunnyDew point 33°
1

Today in Eureka

NEXT 15 HOURS
Now mostly cloudy day 42° 0%
4p partly cloudy day 44° 1%
7p partly cloudy night 39° 2%
10p partly cloudy night 37° 1%
1a partly cloudy night 36° 1%
4a mostly clear night 34° 1%
Mostly cloudy
NEXT RAINTomorrow about 6 PM · 44%
→
Sat0%
Mostly cloudy Mostly cloudy
33
44
A
Sun40%
Chance of showers Chance of showers
36
48
B
Mon30%
Chance of showers Chance of showers
31
44
B
Tue20%
Partly cloudy Partly cloudy
27
39
B
Wed10%
Mostly cloudy Mostly cloudy
27
37
B
Thu20%
Mostly cloudy Mostly cloudy
27
38
B
Fri20%
Partly cloudy Partly cloudy
26
37
B
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
2

What Eureka stands on

Eureka’s center stands about 2,650 ft above sea level. Within three miles the land runs from 2,540 ft to 3,210 ft, a difference of 670 ft: hilly country. The highest named summit within 15 miles is Poorman Mountain, about 7,780 ft, 9 miles northeast.

Eureka, southwest to northeast Eureka2,650 ftGreen Mountain7,760 ft ← SWNE → 24 miles through the town center; vertical exaggeration about 7×. Colors: rock at the surface.
Elevation, center2,650 ft
Within 3 miles2,540 to 3,210 ft
Lie of the landHilly (670 ft of relief)
High point nearbyPoorman Mountain, 7,780 ft, 9 mi northeast
Rock at the surfaceLower Missoula Group: Shepard and Snowslip Formations; or Shepard Formation and unresolved Snowslip Formation equivalent
Its ageMesoproterozoic, 1 to 1.6 billion years old
3

Where the rain goes

≈ 900 mito the Pacific OceanSinclair Creek → Tobacco → Kootenai → Columbia

A raindrop that lands in Eureka reaches the Pacific Ocean by way of Sinclair Creek, the Tobacco, the Kootenai and the Columbia: about 900 river miles.

Lake on the way: Lake Umatilla.

460 miles of the trip are on the Columbia.