Martinez Lake is a small desert reservoir in southwestern Arizona with reliable largemouth bass and catfish

Martinez Lake sits about 40 miles south of Yuma in La Paz County, formed by a dam on the Colorado River. The lake covers roughly 60 surface acres and holds year-round populations of largemouth bass, channel catfish, and flathead catfish. Water levels fluctuate seasonally — the lake is fullest in late spring and early summer when Colorado River flows are highest, and lowest in late fall and winter. The shoreline is mostly undeveloped desert, with limited shade and no services on the water itself.

The lake draws anglers from Yuma and the surrounding region, but it remains quieter than larger Arizona reservoirs. Access is straightforward, regulations are standard Arizona rules, and the fishing is most productive in spring and fall when water temperatures favor both bass and catfish. Summer heat makes midday fishing uncomfortable, and winter can be slow, though catfish bite year-round on the right baits.

Key Takeaways

  • Martinez Lake is a 60-acre Colorado River reservoir south of Yuma with largemouth bass and catfish as the primary species.
  • Spring and fall offer the most consistent fishing; summer heat and winter cold reduce activity, though catfish remain catchable in winter.
  • The lake has one public boat launch at the south end; no fuel, food, or lodging is available at the lake itself.
  • Arizona fishing license and species-specific regulations apply; bass have a 12-inch minimum length limit and a five-fish daily bag limit.
  • Water levels drop significantly in late fall and winter, which can affect launch access and navigation in shallow areas.

Access and Boat Launch Details

The primary public access point is the Martinez Lake Recreation Area, located at the south end of the lake off County Road 24. The launch includes a single concrete ramp, a small parking area, and vault toilets. There is no fuel dock, no bait and tackle shop, and no food service at the lake. Anglers must bring all supplies from Yuma, which is the nearest town with gas, groceries, and restaurants — roughly 40 minutes away by car.

The launch is maintained by the Bureau of Land Management (BLM) and is open year-round during daylight hours. There is no day-use fee. In late fall and winter, when water levels drop, the ramp can become difficult to use if the lake recedes significantly; call the Yuma Field Office of the BLM before making the trip during low-water months to confirm launch conditions.

Anglers with small boats, kayaks, or canoes can launch here. The lake is shallow in many areas — average depth is around 15 feet, with deeper holes near the dam — so know your boat's draft and watch for submerged debris, especially in the upper (northern) end of the lake where the Colorado River enters.

Largemouth Bass Fishing

Largemouth bass are the most sought-after species at Martinez Lake. The population is healthy and fish in the 2- to 5-pound range are common; larger fish over 6 pounds are possible but less frequent. Bass respond well to topwater lures early and late in the day, particularly in spring and fall when water temperatures are moderate.

Spring (March through May) is the prime season. Bass move shallow to spawn, and they feed aggressively before and after the spawn. Crankbaits, soft plastics, and spinnerbaits work well along the shoreline and near any structure — fallen trees, rocks, or dam riprap. Early morning and late afternoon produce the most strikes.

Summer (June through August) slows the bite considerably. Bass retreat to deeper water and shade during the heat of the day. Fish early, before 9 a.m., or wait until evening after 6 p.m. Deeper-diving crankbaits and plastic worms fished slowly near the dam or in the deepest holes offer the best chance. Midday fishing is rarely productive and the heat makes it uncomfortable.

Fall (September through November) brings another strong bite as water cools and bass return to shallower feeding zones. This period rivals spring for consistency. Winter (December through February) is slower, but bass still bite on mild days, particularly around midday when water temperature peaks.

Catfish and Other Species

Channel catfish and flathead catfish are abundant at Martinez Lake and bite year-round. Channel catfish average 2 to 5 pounds and are most active at night and during low-light periods. They respond to cut bait (mackerel, shad, or chicken liver), stink baits, and prepared catfish doughs. Fish the deeper holes near the dam or along the main channel of the old Colorado River bed, which runs through the middle of the lake.

Flathead catfish, an invasive species now well-established in the lake, grow larger — 5 to 20 pounds are common — and are aggressive hunters. They prefer live baitfish (shiners, mullet, or small shad) and are most active at night. Flatheads have no size or bag limit in Arizona, and many anglers target them specifically to help control the population.

Carp are also present and can be caught on dough balls, corn, or specialized carp baits. They are not regulated by species-specific rules and offer a strong fight on light tackle. Crappie and bluegill are occasionally caught but are not abundant enough to target specifically.

Seasons and Water Conditions

Water levels at Martinez Lake follow the Colorado River's seasonal pattern. The lake is highest in late spring and early summer (May through July) when snowmelt from the Rocky Mountains increases river flows. Levels drop steadily through fall and reach their lowest point in late winter (February through March) before rising again in spring.

This cycle affects fishing success and access. Spring and early summer offer the most water, the most comfortable temperatures for fishing, and the most active fish. Fall is also productive, with cooler water and active bass. Summer heat (often exceeding 110°F) makes midday fishing miserable and reduces fish activity. Winter is cold but fishable; catfish bite consistently, though bass are slower.

Water clarity varies with river flows. During high flows, the lake may be slightly turbid from Colorado River sediment. During low flows, clarity improves. Turbid water can actually improve catfish fishing, as they rely on smell and taste rather than sight.

Regulations and Licensing

Arizona fishing regulations apply at Martinez Lake. All anglers 10 years and older must carry a valid Arizona fishing license, available online through the Arizona Game and Fish Department website or at sporting goods stores in Yuma. A license is valid for one year from the date of purchase.

Largemouth bass have a 12-inch minimum length limit and a five-fish daily bag limit. Catfish (channel and flathead combined) have no minimum size and no daily bag limit. Carp and other rough fish have no restrictions. Live baitfish (shiners, shad) may be used, but only species native to Arizona are permitted; check the current regulations before bringing bait from another state.

No gas-powered motors are restricted at Martinez Lake, though the small size of the lake means most anglers use small outboards or trolling motors. Jet skis and other personal watercraft are permitted under Arizona law.

Nearby Lodging and Services

Yuma is the nearest town, about 40 minutes north by car. It has hotels, motels, RV parks, restaurants, and grocery stores. The Yuma area also has several other fishing options — the Colorado River itself has public access points, and Imperial National Wildlife Refuge offers additional water to explore.

If you want to stay closer to the lake, there is no lodging at Martinez Lake itself, but the BLM recreation area allows dispersed camping in the surrounding desert. Bring your own water, fuel, and supplies. Cell service is limited or absent in the area, so plan accordingly.

Frequently Asked Questions

What is the best time of year to fish Martinez Lake?

Spring (March through May) and fall (September through November) offer the most consistent fishing for both bass and catfish, with moderate water temperatures and active fish. Summer is hot and slow; winter is cold but catfish bite year-round on the right baits.

Can I launch a kayak or canoe at Martinez Lake?

Yes. The public launch at the recreation area accommodates small boats, kayaks, and canoes. The lake is shallow in many areas, so watch for submerged debris and know your boat's draft. Water levels drop in winter, which can affect launch conditions.

Do I need a separate permit to fish Martinez Lake?

No. A standard Arizona fishing license is all you need. There is no day-use fee at the recreation area, and no additional permits are required for the lake itself.

Are there fish to catch in winter?

Yes. Catfish bite consistently year-round, especially at night or during low-light periods. Bass are slower in winter but still catchable on mild days. Spring and fall are more productive, but winter fishing is possible if you are prepared for cold weather.

What should I bring to Martinez Lake?

Bring all fuel, food, water, and bait from Yuma — there are no services at the lake. Sunscreen, a hat, and plenty of water are essential in the desert. In summer, plan to fish early morning and evening to avoid the midday heat. In winter, bring warm clothing.