What the Refuge Protects
Imperial National Wildlife Refuge was established in 1941 and covers roughly 25,768 acres, including a designated wilderness area within its boundary, spread across Imperial County, California, and La Paz and Yuma counties, Arizona. It protects 30 miles of the lower Colorado River -- the last stretch that has not been straightened into a channel before the river crosses into Mexico -- along with the backwater lakes, marshes, and riparian forest that stretch of river still supports.
That mix of river, wetland, and surrounding desert upland supports a wide range of wildlife: desert bighorn sheep and mule deer on the higher ground, and more than 50 recorded bird species in the wetlands, including bald eagles, osprey, great egrets, and wintering sandhill cranes. The refuge also borders Picacho State Recreation Area on the California side.
Martinez Lake: The Gateway Community
Martinez Lake, Arizona, founded in 1958 as a fishing community, is the small unincorporated settlement closest to the refuge and the last stop for gas, food, or a place to stay before the road turns to gravel. It sits on a backwater lake formed off the Colorado River and has long drawn anglers and boaters as much as birders, which is worth knowing if you're picturing the refuge as strictly a hiking-and-viewing destination -- around Martinez Lake, boating and fishing are just as much the point.
Painted Desert Trail and Meers Point
The Painted Desert Trail is the refuge's signature hike: a roughly 1.3-mile gravel loop rated moderate, climbing through volcanic ash formations the refuge dates to about 30,000 years old, with a payoff view over the Colorado River valley from the top. The trailhead is a few miles north of the visitor center off Red Cloud Mine Road.
The Meers Point Trail is shorter and flatter, about 0.8 miles on gravel, and it doubles as a practical stop -- a comfort station, picnic tables, and a boat launch sit alongside it, making it a reasonable break point for anyone out on the water rather than only on foot.
Getting There and Visitor Center Hours
From Yuma, take Highway 95 north and turn west onto Martinez Lake Road, between mile markers 46 and 47. Follow it roughly 10 miles, then turn north onto Red Cloud Mine Road and follow the brown refuge signs about 3 more miles to the headquarters and visitor center, which has a birding observation deck and a desert pupfish pond. There is no charge to enter the refuge.
The visitor center itself has run a seasonal schedule -- Friday through Sunday, 10 a.m. to 4 p.m., from November 1 through March 31, closed the rest of the year -- and is staffed largely by volunteers, so hours can shift. Call the refuge office at (928) 783-3371 before you drive out, particularly outside the winter window.
Hunting, Fishing, and Boating
The refuge allows hunting and fishing in designated areas and seasons, alongside boating on the river and the backwater lakes near Martinez Lake -- consistent with the community's history as a fishing outpost. Overnight camping is not permitted on refuge land itself. Contact the refuge office for current season dates and licensing requirements rather than assuming last year's rules carry over.
Don't Mix It Up With Kofa or the Sand Dunes
Three very different "wild" destinations sit within a short drive of Yuma, and it is easy to conflate them. Imperial National Wildlife Refuge is river and wetland habitat north of town near Martinez Lake. Kofa National Wildlife Refuge, covered in our separate guide, is desert mountain terrain further northeast, built around Palm Canyon's native fan palms and desert bighorn sheep. The Imperial Sand Dunes are a different thing entirely -- a sand-dune recreation area west of Yuma in California, popular with off-road vehicles rather than wildlife viewing. If a trip plan mentions "Imperial" and dunes in the same sentence, double-check which one is actually meant before you drive.