What Hirz Bay offers and when to fish it

Hirz Bay is a shallow, weedy arm of the Sacramento–San Joaquin Delta near Stockton, California, known for striped bass and catfish in a setting that rewards patience and local knowledge. The bay sits in San Joaquin County, accessible by boat launch from nearby marinas, and produces year-round but peaks in spring and early summer for stripers and late summer through fall for catfish. Water levels and clarity shift with Delta operations, and the shallow bottom—often 4 to 8 feet deep—means tides and time of day matter more than in deeper channels.

The bay's appeal lies in its combination of structure and seclusion. Tule banks, submerged vegetation, and scattered pilings create holding zones for stripers moving through the Delta system. Catfish congregate in deeper pockets and along channel edges, especially at night. The water is brackish to fresh depending on outflow, and salinity changes affect which species are active and where they hold. Most anglers fish from small boats or kayaks; wading is possible in some areas but the bottom is soft and uneven.

Key Takeaways

  • Striped bass fishing peaks April through June; catfish are most active July through October, especially after dark.
  • Launch from nearby marinas like Stockton Deep Water Ship Channel or private ramps; confirm current access before you go.
  • Tides and Delta outflow control water clarity and fish location, so check tide tables and Delta conditions before fishing.
  • California fishing regulations require a valid sport fishing license and striped bass have a daily bag limit of two fish with a 18-inch minimum length.

Striped bass season and technique

Spring stripers in Hirz Bay respond to live bait and soft plastics worked along the tule banks and around submerged structure. April through June is the prime window; water temperatures in the 60s to low 70s trigger feeding, and spawning activity pushes fish into shallow bays. Dawn and dusk are most productive, though overcast days can extend the bite. Live threadfin shad, if available, or live shiners work well; jigged plastics in 3 to 5 inches, rigged on 1/4- to 1/2-ounce heads, cover water efficiently.

Summer stripers (July and August) become deeper and less predictable as water warms. Early morning fishing before 9 a.m. is essential. Deeper channel edges and the mouths of sloughs hold fish during midday heat. By late summer, stripers thin out as many move into deeper Delta channels or toward the ocean. Fall can bring a secondary bite in October and November if water cools and outflow increases, but it is less reliable than spring.

Catfish fishing after dark

Channel catfish and white catfish dominate Hirz Bay from July through October, with peak activity in August and September. Night fishing is the standard approach; most anglers fish from sunset through midnight or later. Chicken liver, mackerel, squid, and prepared catfish baits work consistently. Cast near deeper holes, channel edges, and around any submerged wood. A simple three-way rig with a sinker and a 12- to 18-inch leader to a circle hook (size 2/0 to 4/0) is effective and reduces gut-hooking.

Catfish bite year-round but are sluggish in winter and early spring. Summer night temperatures in the 70s and 80s trigger aggressive feeding. Bring a headlamp, a cooler, and patience; catfish fishing is often slow in terms of action but can yield 10 to 20 fish in a night session. The bay's shallow, weedy character means you will snag bottom frequently, so bring extra rigs and sinkers.

Access, launches, and boat requirements

Hirz Bay is accessed by boat only. The nearest public launch is at Stockton Deep Water Ship Channel, operated by the Port of Stockton, roughly 5 to 10 minutes by boat from the bay. Other options include private marinas and ramps in the Stockton area; call ahead to confirm they are open and to ask about launch fees, which typically range from $5 to $10. Some private ramps require membership or have restricted hours.

A small center-console, aluminum skiff, or kayak works well for Hirz Bay. The water is shallow and often weedy, so a boat with a shallow draft and a tiller-steer outboard or electric trolling motor is ideal. Kayakers should be comfortable with tides and current; the bay is protected but tidal flow can be swift. Bring a GPS or map; the bay's channels and sloughs can be confusing, especially at low tide or in poor visibility. A depth finder is useful for locating deeper pockets where catfish hold.

Tides, water conditions, and Delta operations

Hirz Bay's fish activity is tightly linked to tidal stage and Delta outflow. Incoming tides push stripers into shallow bays and activate feeding; outgoing tides often slow the bite. Check tide tables for the Stockton area before you fish. Delta outflow—controlled by releases from upstream reservoirs—affects water clarity and salinity. High outflow (spring snowmelt, dam releases) pushes fresh water through the system, clears visibility, and can trigger striper feeding. Low outflow (summer, drought) allows saltwater intrusion, reduces clarity, and shifts fish behavior.

Water clarity in Hirz Bay ranges from clear (after heavy outflow) to turbid (during low-flow periods). Stripers tolerate a range of clarity but bite more aggressively in slightly stained water (12 to 18 inches of visibility). Catfish are not affected by clarity and fish equally well in murky conditions. Check the U.S. Geological Survey Delta outflow gauge or ask at local marinas for current conditions before you launch.

Regulations and licensing

California requires a valid sport fishing license for anyone 16 and older. Licenses are available online through the California Department of Fish and Wildlife website, at sporting goods retailers, and at some marinas. A one-day license costs less than a year-long license if you fish infrequently.

Striped bass in California have a daily bag limit of two fish with an 18-inch minimum length. Catfish (channel and white catfish combined) have a daily limit of 25 fish with no minimum size, though most anglers practice catch-and-release or keep only larger fish for eating. Check current regulations on the CDFW website before you fish, as rules can change. Hirz Bay is open year-round, but always confirm local closures or advisories.

What to bring and safety considerations

Bring a personal flotation device (PFD) for every person on the boat; California law requires it. A first-aid kit, a flashlight or headlamp, and a fully charged cell phone are essential. The Delta can be windy and choppy in afternoon hours, especially in spring; launch early and be ready to return by midday if conditions deteriorate. Wear polarized sunglasses to spot structure and fish, and bring sunscreen and a hat.

Hirz Bay's shallow, weedy bottom means you will run aground or snag if you are not paying attention. Carry a push pole or oar to free yourself. Mosquitoes can be intense in summer and fall, especially at dawn and dusk; bring insect repellent. The bay is part of the Delta system, which has strong currents in some channels; stay alert and do not venture into unfamiliar water at night or in low visibility.

Frequently Asked Questions

What is the best time of year to fish Hirz Bay?

April through June for striped bass, and July through October for catfish. Spring stripers are most active in the morning and around tides. Catfish bite best at night, especially in August and September when water is warmest.

Do I need a boat to fish Hirz Bay?

Yes, Hirz Bay is accessible by boat only. A small skiff, kayak, or center-console works well. Launch from Stockton Deep Water Ship Channel or nearby private marinas.

What bait and lures work best?

For stripers, use live threadfin shad or shiners, or soft plastics (3 to 5 inches) on light jigs. For catfish, use chicken liver, mackerel, squid, or prepared catfish baits fished on the bottom at night.

How do tides affect fishing in Hirz Bay?

Incoming tides push stripers into shallow water and trigger feeding; outgoing tides often slow the bite. Check tide tables for Stockton before you fish. Delta outflow also matters—high outflow clears water and can activate stripers.

Is Hirz Bay safe for beginners?

The bay itself is shallow and protected, but it is part of the Delta system with tidal currents and can be confusing to navigate. Beginners should fish with someone familiar with the area or hire a guide. Always wear a PFD and bring a GPS or map.