Located in Marion County, Oregon, Rock Bridge is a natural arch at about 1,312 m (4,304 ft) above sea level. The nearest town is Mill City, about 16.3 km (10.1 mi) away (Rock Bridge lies ENE of town).
Sunrise & sunset directions
At Rock Bridge the sunrise point swings a long way through the year: about 55° (NE) at the June solstice and 123° (ESE) in late December. Sunset moves from 305° (NW) in June to 237° (WSW) in December, and the midday sun climbs to 69° in summer but only 22° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:13 AM | 90° E | 7:22 PM | 271° W | 45° | 12h 09m |
| June solstice (Jun 21) | 5:24 AM | 55° NE | 8:59 PM | 305° NW | 69° | 15h 35m |
| September equinox (Sep 22) | 6:57 AM | 89° E | 7:08 PM | 271° W | 45° | 12h 11m |
| December solstice (Dec 21) | 7:44 AM | 123° ESE | 4:32 PM | 237° WSW | 22° | 8h 47m |
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
Arches glow when reflected light bounces off nearby rock — the underside of an arch often turns bright orange just after sunrise or before sunset.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 7:11 AM | 7:44 AM | 8:30 AM | 4:08 PM | 4:55 PM | 5:27 PM | 9h 11m |
| February | 6:40 AM | 7:11 AM | 7:52 AM | 4:57 PM | 5:38 PM | 6:08 PM | 10h 27m |
| March | 6:53 AM | 7:22 AM | 8:01 AM | 6:37 PM | 7:15 PM | 7:45 PM | 11h 53m |
| April | 5:55 AM | 6:25 AM | 7:05 AM | 7:15 PM | 7:54 PM | 8:25 PM | 13h 29m |
| May | 5:08 AM | 5:42 AM | 6:24 AM | 7:49 PM | 8:31 PM | 9:05 PM | 14h 50m |
| June | 4:46 AM | 5:23 AM | 6:08 AM | 8:12 PM | 8:57 PM | 9:35 PM | 15h 34m |
| July | 5:02 AM | 5:38 AM | 6:22 AM | 8:09 PM | 8:53 PM | 9:29 PM | 15h 15m |
| August | 5:40 AM | 6:12 AM | 6:53 AM | 7:36 PM | 8:17 PM | 8:49 PM | 14h 05m |
| September | 6:19 AM | 6:49 AM | 7:27 AM | 6:43 PM | 7:22 PM | 7:51 PM | 12h 33m |
| October | 6:56 AM | 7:25 AM | 8:05 AM | 5:46 PM | 6:26 PM | 6:55 PM | 11h 01m |
| November | 6:35 AM | 7:07 AM | 7:51 AM | 3:58 PM | 4:42 PM | 5:14 PM | 9h 35m |
| December | 7:07 AM | 7:41 AM | 8:29 AM | 3:41 PM | 4:30 PM | 5:03 PM | 8h 49m |
Local time (America/Los Angeles), 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 Rock Bridge, the Milky Way core is visible in a dark sky from April through September. June gives the longest window (about 3.3 hours on a moonless night), and the core peaks around 16° above the southern horizon. Our light-pollution model puts the sky at about Bortle 3 (rural sky), good enough for detailed Milky Way images.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -4° | — |
| February | Below 10° in darkness | — | 7° | — |
| March | 5:13 AM – 5:33 AM | 0.3 | 12° | SSE → SSE |
| April | 3:11 AM – 4:31 AM | 1.3 | 16° | SSE → S |
| May | 1:09 AM – 3:29 AM | 2.3 | 16° | SSE → S |
| June | 11:28 PM – 2:48 AM | 3.3 | 16° | SSE → SSW |
| July | 11:12 PM – 1:32 AM | 2.3 | 16° | S → SSW |
| August | 10:11 PM – 11:31 PM | 1.3 | 15° | SSW → SSW |
| September | 9:02 PM – 9:32 PM | 0.5 | 12° | SSW → SSW |
| October | Below 10° in darkness | — | 7° | — |
| November | Below 10° in darkness | — | -3° | — |
| December | Below 10° in darkness | — | -20° | — |
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: 3 Bortle 3 — Rural sky. Some light domes sit on the horizon, but the Milky Way still looks complex overhead. Modeled zenith brightness ≈ 21.51 mag/arcsec². Aurora needs roughly Kp 6.0+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show July as the clearest month (about 28% average cloud cover) and December as the cloudiest (78%). August is the warmest month and December 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 | 68 | 73 | 86 | 97 | 98 | 106 | 103 | 98 | 87 | 78 | 61 |
| Low °F | 9 | 7 | 17 | 22 | 28 | 36 | 42 | 40 | 35 | 25 | 10 | 6 |
| Precip. (in) | 8.1 | 6.3 | 7.2 | 5.4 | 3.5 | 2.3 | 0.4 | 0.6 | 2.3 | 4.9 | 8.4 | 9.9 |
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 natural arch
- Never climb on arches; many are fragile and climbing is prohibited on park lands.
- Midday sun creates hard shadows, but can light the underside through reflection in narrow canyons.
- Frame distant features through the opening of the arch for a natural window.
- At night, arches make classic Milky Way foregrounds; low-level lighting or blue hour exposures keep the rock detailed.
- Use a wide lens and get close to emphasize the span against the sky.
- Bring a spare battery — cold weather and long exposures drain them fast.
Season: Spring and autumn offer mild temperatures in desert arch country; summer heat is extreme at midday.
Suggested gear: Ultra-wide lens, Tripod, Headlamp, Plenty of water. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Rock Bridge, closest first.
Natural Arch
Waterfall
Ghost Town
Wilderness Area
WaterfallWaterfall
Lake
Wilderness Area
Fire LookoutCampgrounds nearby (Recreation.gov)
- Shady Cove7.0 km (4.3 mi) · reservable
- Piety Island11.6 km (7.2 mi) · reservable
- Southshore At Detroit Lake - Willamette (Or)11.8 km (7.3 mi) · reservable
- Cove Creek (Or)12.3 km (7.6 mi) · reservable
- Elk Lake Campground12.4 km (7.7 mi)
FAQ
When is the best time to photograph Rock Bridge?
What time is golden hour at Rock Bridge?
Where does the sun rise and set at Rock Bridge?
Can you see the Milky Way from Rock Bridge?
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How far is Rock Bridge from Mill City?
Sources
Location data: USGS GNIS / GeoNames. 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.