Openings · last 7 days
0
01 · Detected Opening History · the openings record · file CS-234534
When Union Flat reopens
Union Flat's openings record: every site-date Campsite Sniper detected turning available, logged and time-stamped. Refreshed hourly.
Openings · last 30 days
0
Openings · last 90 days
6
Only 6 openings in the last 90 days: not enough recent activity for a reliable pattern. A free Campsite Sniper alert watches around the clock instead, and pings you the moment one opens.
02 · Availability Outlook · Apr 15 – May 3, 2027 · of 11 monitored sites
Of the 209 tracked site-nights (Apr 15 – May 3, 2027): 190 open for online reservation · 19 on sites not offered for online reservation (first-come, first-served or administrative). Of the facility's 11 monitored sites, 10 can be reserved online and 1 are first-come, first-served.
Where the open windows are
9.1% of tracked site-nights are not currently open for online reservation. 190 of 209 remain open; here is where they are.
Load status
Apr 15 – May 3, 2027Not open online9.1%
Open site-nights190 / 209
Reserved (of online inventory)0 / 190
Weekday openings100
Weekend openings90
Of the open site-nights on mapped sites, 100 fall on weekdays and 90 on weekends (Fri–Sun).
Open dates by month
Apr 2027 – May 2027April holds the most room. 160 of 176 site-nights are still open there.
Holiday windows
Sites open per night · of 11 sites| Window | Night | Sites open | Status |
|---|---|---|---|
| Memorial Day | FRI May 28 | 0 | None open |
| SAT May 29 | 0 | None open | |
| SUN May 30 | 0 | None open | |
| MON May 31 | 0 | None open |
Memorial Day: no online availability on any tracked night.
Best-availability sites
Most open site-nights · tracked window| Site | Open site-nights |
|---|---|
| 001 | 19 |
| 002 | 19 |
| 004 | 19 |
| 005 | 19 |
| 006 | 19 |
The 5 sites with the most open site-nights in the current snapshot. Pair a bookable date with a free alert to cover everything else.
Tracked window
CoverageCampsite Sniper's data for this facility starts Apr 15, 2027. That is about 164 days after the current snapshot was taken, so dates before Apr 15, 2027 are not covered by what Campsite Sniper tracks here — they are not known to be unavailable. The site-nights shown on this page describe Apr 15, 2027 onwards only. Check Recreation.gov for earlier dates.
Stays and site detail
190 open site-nights across 10 sites at Union Flat, from the same hourly snapshot as everything above.
Multi-night stays. 10 2-night, 10 3-night, 10 7-night openings where a single site is free for every night, per Campsite Sniper's current snapshot — soonest Apr 15, 2027 at site 001.
RV length. Longest recorded site here is 50 ft. 7 sites take 25 ft, 3 sites take 35 ft, 2 sites take 40 ft.
All 10 sites with current availability
| Site | Max RV | Hookups | Open site-nights | Longest run | Dates |
|---|---|---|---|---|---|
| 001 | 40 ft | None | 19 | 19 nights | Apr 15, 2027, Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027 +7 more |
| 002 | 25 ft | None | 19 | 19 nights | Apr 15, 2027, Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027 +7 more |
| 004 | 20 ft | None | 19 | 19 nights | Apr 15, 2027, Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027 +7 more |
| 005 | 50 ft | None | 19 | 19 nights | Apr 15, 2027, Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027 +7 more |
| 006 | 20 ft | None | 19 | 19 nights | Apr 15, 2027, Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027 +7 more |
| 007 | 20 ft | None | 19 | 19 nights | Apr 15, 2027, Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027 +7 more |
| 008 | 31 ft | None | 19 | 19 nights | Apr 15, 2027, Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027 +7 more |
| 009 | 27 ft | None | 19 | 19 nights | Apr 15, 2027, Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027 +7 more |
| 010 | 20 ft | None | 19 | 19 nights | Apr 15, 2027, Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027 +7 more |
| 011 | 36 ft | None | 19 | 19 nights | Apr 15, 2027, Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027 +7 more |
About Union Flat
Overview
Union Flat Campground is located on the North Yuba River, near Highway 49. Visitors enjoy a wide variety of recreational activities in the area, including hiking, hunting, fishing, canoeing and gold panning.
Facilities
The campground offers several single-family campsites and one double site. Some sites are designated for tent camping only. Each site is equipped with a picnic table and campfire ring. Vault toilets are provided.
Natural Features
The campground stretches along the north bank of the North Yuba River. A tumbled rock wall from early gold dredging activity separates campsites from the river. A forest of pine, fir, maple and oak trees covers the area, offering shade in many sites.
Nearby Attractions
Union Flat Campground is located on the Yuba Donner Scenic Byway (Highway 49) near many gold rush era historical sites and old mining towns such as Goodyears Bar, Sierra City, and Downieville. Many points of interest lie along Highway 49 and are part of the 49 miles of Highway 49 driving tour; look for interpretive signs and other historical sites along this tour route. Gold Lakes Basin offers boating, fishing, biking, and hiking. Boating, fishing and swimming are available at nearby Sardine Lakes, about 14 miles east of the campground. Sardine Lakes Resort offers boat rentals, lodging, and a restaurant. On the water, visitors enjoy boating and fishing. Anglers will find rainbow and brook trout in many of the lakes, streams, and rivers throughout the basin. Over 30 miles of maintained trails for hiking, mountain biking, and motorcycle singletrack branch out across the area and the Pacific Crest Trail can be accessed at a few spots east of Sierra City and in the Gold Lakes Basin area. The historic towns of Sierra City and Downieville offer historic and cultural attractions, restaurants, shops, churches, and vistor information.
11 monitored sites1 FCFS siteRVs up to 50 ftNo hookups11 shadedWaterfrontRiverfrontPets OKFire pitsMax party 12
Getting there
From Downieville, take Highway 49 north about 6 miles. The campground is on the right side of the highway.
Yuba River Ranger Station, Nevada City, CA 95959(530)478-6253
BikingCampingFishingHuntingKayakingMountain BikingScenic DriveSwimming SiteWater AccessWater Activities
View on Recreation.gov ↗ Get directions ↗
03 · Field Photos · roll CS-234534 · facility + sites
Photo gallery
Roll CS-234534 · Union Flat · Nevada City CA12 frames · facility + sites
FAQ
How do I get a reservation at Union Flat?
Reservations for Union Flat are made through Recreation.gov. The current snapshot shows substantial availability: 190 of 209 tracked site-nights are open (90.9%), though availability can change. Campsite Sniper has also detected 6 site openings here in the last 90 days, so further dates may appear. Pick a site on the map to see its calendar, or set a free Campsite Sniper alert. You complete the reservation yourself on Recreation.gov.
Does Campsite Sniper book this campground for me?
No. Campsite Sniper sends alerts and direct Recreation.gov links. It never books, pays for, holds, hoards, or resells reservations.
How current is this availability data?
Campsite Sniper re-checks public Recreation.gov availability for this facility every hour and republishes whenever anything changes. This facility's data last changed at Nov 2, 2026 19:20 UTC; an older timestamp means nothing has changed since that time, not that checking stopped. Always confirm final availability on Recreation.gov when you book.
How often do new openings appear at Union Flat?
Campsite Sniper detected 6 site-date openings here over the last 90 days, none in the last 7. A free alert watches around the clock and pings you the moment one appears.
Can I get a multi-night stay at Union Flat?
10 three-night openings are showing, counting only runs where the SAME site is free for all three nights. The soonest starts Apr 15, 2027 at site 001. Confirm and book on Recreation.gov.
Which sites at Union Flat fit a 35-foot RV?
3 of the 11 sites that support RV analysis have a recorded maximum of 35 ft or more; the longest recorded is 50 ft.
Which month has the most availability at Union Flat?
April 2027, with 160 open site-nights in the current snapshot of 176.
When is the next open date at Union Flat?
Campsite Sniper cannot answer that from the current snapshot. The availability data held for Union Flat begins Apr 15, 2027 — about 164 days after this snapshot was taken, so any earlier dates are outside what Campsite Sniper is tracking here rather than known to be unavailable. Check Recreation.gov for dates before Apr 15, 2027.
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