Located in Montgomery County, Maryland, Mather Gorge is a canyon. It lies in or next to Chesapeake & Ohio Canal National Historical Park, so park hours, fees and rules apply. The nearest town is Great Falls, about 3.0 km (1.9 mi) away (Mather Gorge lies E of town).
Mather Gorge is a river gorge south and just downriver of Great Falls in the state of Maryland bordering Virginia. The Maryland land side of the gorge is Bear Island, part of the Chesapeake and Ohio Canal National Historical Park, and the Virginia side is part of Great Falls Park. Both parks are National Park Service sites. The gorge is named after Stephen Mather, the first director of the National Park Service. The gorge is cut by the Potomac River and is, for the most part, lined on both sides by cliffs. Towards the southern end of the gorge, the cliffs become tree-lined bluffs as the gorge widens out into the wider and larger Potomac Gorge. At Little Falls, the Potomac River crosses the Fall Line as it leaves the Appalachian Piedmont and enters the Atlantic Coastal Plain.From the Wikipedia article “Mather Gorge”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Mather Gorge the sunrise point swings a long way through the year: about 59° (ENE) at the June solstice and 120° (ESE) in late December. Sunset moves from 302° (WNW) in June to 240° (WSW) in December, and the midday sun climbs to 74° in summer but only 28° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:13 AM | 90° E | 7:21 PM | 271° W | 51° | 12h 08m |
| June solstice (Jun 21) | 5:44 AM | 59° ENE | 8:39 PM | 302° WNW | 74° | 14h 54m |
| September equinox (Sep 22) | 6:57 AM | 89° E | 7:08 PM | 271° W | 51° | 12h 10m |
| December solstice (Dec 21) | 7:25 AM | 120° ESE | 4:51 PM | 240° WSW | 28° | 9h 26m |
Azimuth is measured clockwise from true north (90° = east, 270° = west). Computed for 2026; values change by less than a degree from year to year.
Golden hour & blue hour by month
Canyons need light from above: rims glow at sunrise and sunset, while deep or narrow sections are brightest near midday when reflected light bounces off the walls.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 6:58 AM | 7:27 AM | 8:08 AM | 4:30 PM | 5:11 PM | 5:40 PM | 9h 44m |
| February | 6:34 AM | 7:02 AM | 7:39 AM | 5:10 PM | 5:47 PM | 6:14 PM | 10h 45m |
| March | 6:55 AM | 7:21 AM | 7:57 AM | 6:41 PM | 7:16 PM | 7:43 PM | 11h 55m |
| April | 6:05 AM | 6:33 AM | 7:09 AM | 7:10 PM | 7:46 PM | 8:14 PM | 13h 13m |
| May | 5:27 AM | 5:57 AM | 6:35 AM | 7:37 PM | 8:15 PM | 8:45 PM | 14h 18m |
| June | 5:12 AM | 5:44 AM | 6:24 AM | 7:57 PM | 8:37 PM | 9:09 PM | 14h 53m |
| July | 5:25 AM | 5:56 AM | 6:35 AM | 7:56 PM | 8:35 PM | 9:06 PM | 14h 39m |
| August | 5:55 AM | 6:23 AM | 7:00 AM | 7:29 PM | 8:06 PM | 8:34 PM | 13h 42m |
| September | 6:24 AM | 6:51 AM | 7:26 AM | 6:44 PM | 7:19 PM | 7:46 PM | 12h 28m |
| October | 6:52 AM | 7:19 AM | 7:55 AM | 5:56 PM | 6:32 PM | 6:59 PM | 11h 13m |
| November | 6:24 AM | 6:53 AM | 7:32 AM | 4:17 PM | 4:56 PM | 5:25 PM | 10h 04m |
| December | 6:52 AM | 7:22 AM | 8:04 AM | 4:06 PM | 4:48 PM | 5:18 PM | 9h 27m |
Local time (America/New York), including daylight saving time. Golden hour runs from about −4° to +6° solar altitude, so the morning golden hour begins during blue hour, before sunrise.
Milky Way & night sky
From Mather Gorge, the Milky Way core is visible in a dark sky from March through September. June gives the longest window (about 5.0 hours on a moonless night), and the core peaks around 22° above the southern horizon. Our light-pollution model puts the sky at about Bortle 7 (suburban / urban transition), so expect visible sky glow; drive away from towns for better results.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -2° | — |
| February | 5:16 AM – 5:26 AM | 0.2 | 12° | SE → SE |
| March | 4:25 AM – 5:45 AM | 1.3 | 19° | SE → SSE |
| April | 2:21 AM – 4:51 AM | 2.5 | 22° | SE → S |
| May | 12:23 AM – 4:03 AM | 3.7 | 22° | SE → S |
| June | 10:36 PM – 3:36 AM | 5.0 | 22° | SE → SSW |
| July | 10:29 PM – 2:19 AM | 3.8 | 22° | SSE → SW |
| August | 9:45 PM – 12:15 AM | 2.5 | 22° | S → SW |
| September | 8:50 PM – 10:10 PM | 1.3 | 19° | SSW → SW |
| October | 8:01 PM – 8:11 PM | 0.2 | 12° | SW → SW |
| November | Below 10° in darkness | — | 0° | — |
| December | Below 10° in darkness | — | -19° | — |
Window when the galactic core is at least 10° high during astronomical darkness on the 15th of each month. Pick nights within a few days of the new moon. Plan exact nights with the Milky Way planner.
Estimated sky darkness: 7 Bortle 7 — Suburban / urban transition. The whole sky has a grey-white glow; the Milky Way is invisible to the eye. Modeled zenith brightness ≈ 18.4 mag/arcsec². Aurora needs roughly Kp 7.0+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show September as the clearest month (about 52% average cloud cover) and December as the cloudiest (66%). July is the warmest month and January the coldest, which matters for gear, snow access and how long batteries last at night.
Average cloud cover (%)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 68 | 76 | 78 | 89 | 91 | 98 | 103 | 100 | 98 | 95 | 78 | 72 |
| Low °F | -3 | -10 | -5 | 22 | 29 | 42 | 52 | 52 | 40 | 25 | 15 | 6 |
| Precip. (in) | 2.6 | 2.9 | 3.2 | 3.7 | 4.5 | 4.4 | 4.2 | 3.6 | 4.4 | 3.9 | 3.1 | 3.5 |
Monthly climatology for the surrounding 1° grid cell from NASA POWER (MERRA-2). Mountain sites can be colder and cloudier than the cell average.
Photography tips for this canyon
- Check flash flood forecasts before entering slot or narrow canyons — rain miles away can flood them.
- Dust and sand are hard on gear; change lenses in a bag or with your back to the wind.
- A long lens on a tripod handles the low light inside canyons better than raising ISO.
- From the rim, sunrise and sunset side-light reveals layers; a telephoto picks out buttes and shadows.
- Check road and trail conditions with the managing agency before you go.
Season: Spring and autumn are comfortable; summer monsoon storms bring dramatic skies but higher flood risk in the Southwest.
Suggested gear: Tripod, Wide and telephoto lenses, Lens blower, Weather radio or app. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Permits, drones & access
National Park Service rules. Under federal law (54 U.S.C. 100905), still photography in National Park Service areas needs a permit only when it (1) takes place where members of the public are not allowed, (2) uses models, sets or props that are not part of the location's natural or cultural resources or administrative facilities, or (3) would cause the park to incur additional administrative costs to monitor the activity. Ordinary visitor and most landscape photography needs no permit. Commercial filming rules are separate and have changed in recent years — confirm current requirements with the park before a paid shoot.
Drones: Launching, landing or operating unmanned aircraft (drones) is prohibited in National Park Service units under a 2014 Superintendent's closure (36 CFR 1.5), except where a park has issued specific written approval. Flying from outside the boundary over park land can also violate park rules and disturb wildlife.
Nearby photo spots
Other locations within 25 km of Mather Gorge, closest first.
Waterfall
Botanical Garden
Rock Formation
Waterfall
State Park
Beach
State Park
Botanical Garden
LakeCampgrounds nearby (Recreation.gov)
- Swains Lock Hiker-Biker Campsite3.5 km (2.2 mi)
- Marsden Tract Group Campsite4.0 km (2.5 mi) · reservable
- Carderock Recreation Area Pavilion5.6 km (3.5 mi) · reservable
- Horsepen Branch Hiker-Biker Overnight (Hbo) Campsite14.6 km (9.1 mi)
- Rock Creek Park Group Picnic Areas (Dc)18.3 km (11.4 mi) · reservable
FAQ
When is the best time to photograph Mather Gorge?
What time is golden hour at Mather Gorge?
Where does the sun rise and set at Mather Gorge?
Can you see the Milky Way from Mather Gorge?
Do you need a permit to photograph at Mather Gorge?
How far is Mather Gorge from Great Falls?
Sources
Location data: Wikidata, Wikipedia. Sun, moon and Milky Way times are computed by LWPhoto Atlas for 2026. Climate: NASA POWER. Sky darkness is a population-based estimate (Walker's law), not a measurement. See data sources & licenses.