Reading a Rip-Rap Bank in July

Two in the afternoon in late July, 29 degrees, dead calm, and the bay I’d spent the morning in had shut off completely. Not slow — off. I ran to the causeway, set the boat in fourteen feet of water about a cast off the rock, and dragged a 3/8 oz football jig with a green pumpkin craw down the slope. Three fish in twenty minutes, all of them on the same twelve-foot stretch where the rock changed from fist-sized to boulder.

That’s rip-rap in midsummer. The whole bank looks identical from the boat and almost none of it holds fish. Learning to see the small percentage that does is the difference between a productive July afternoon and a long boat ride.

Why rock in July

People talk about rip-rap as a spring pattern because rock absorbs heat and warms the water around it. True in April, mostly irrelevant in July — nobody needs extra warmth in July. Midsummer rock holds fish for four different reasons:

• Crayfish. Broken angular rock is full of gaps, and gaps are crayfish habitat. Midsummer is peak crayfish activity, and a bank with a crayfish population feeds bass all day without them having to chase anything.
• The food chain on the rock face. Algae grows on sun-exposed rock, invertebrates eat the algae, minnows and young-of-year baitfish eat the invertebrates. Rip-rap is a whole system, not just structure.
• Vertical access. On a steep causeway a fish can move from three feet to twenty in the length of a cast. In July that means it can sit somewhere comfortable and still feed shallow on a fifteen-minute window without committing to a long move.
• Current and wind. Causeways pinch water. Wind funnels along them and, on flowages and river systems, current sweeps across the ends. Moving water in July is oxygen, and oxygen concentrates fish.

Not all rip-rap is the same

Before you make a cast, idle the length of it and look at three things.

Rock size. Pea gravel and fist-sized rock have small gaps and hold small forage. Truck-tire boulders have caves in them, shade underneath, and big crayfish. Most causeways have both, and the seam where the size changes is a spot every single time.

Slope. A steep face drops into deep water fast and holds fish tight to the bank all day. A long taper needs sun, wind or low light to be worth fishing at midday. Watch your electronics as you idle and note where the slope changes.

Transitions and interruptions. Where the rock ends and natural bank or weed begins. Culverts. Bridge pilings. The inside and outside corners where the causeway bends. A single laid-down tree in the rock. Those spots hold a badly disproportionate share of the fish on the bank, and they’re what you’re actually fishing — the rock in between is what you cover on the way from one to the next.

How to work it

Position the boat so you’re casting along the bank, not at it. A 45-degree or fully parallel cast keeps the bait in the strike zone for the whole retrieve. A perpendicular cast puts it in the zone for four feet and then drags it out into open water, which is why people fish a rip-rap bank for an hour and conclude nothing lives there.

Make two passes. The first is fast — a squarebill or a lipless, thrown parallel, covering the length of it to find out where they are and how they’re set up. The second is slow, back over the water where you got bit or had a follow, with something on bottom.

When you get a bite, note the depth, the rock size, and whether it was in sun or shade. That combination almost always repeats on the next causeway, and on the same one tomorrow.

Sun angle and shade lines

Early, one whole face of a causeway is in shade and the other is lit. Fish the shaded side first — but don’t ignore the lit side, because bait warms up and moves onto the sunny rock faster than most people expect.

By late morning the shade collapses down to almost nothing: the underside of a bridge, the deep side of a culvert, the lee of a single big boulder. That’s when accuracy beats distance. Skip a bait right up under the bridge deck and work it out of the dark and into the light. Fish sitting in that shade line are facing the bright side, waiting for something to come out of it.

Late in the day the shade stretches back out, fish push up shallow again, and the top three feet of rock becomes the best water on the lake for about forty minutes.

Wind blowing into the rock

Wind on rip-rap in July is the best thing that can happen to you. Two feet of chop breaking on rock stirs up sediment and crayfish, pushes plankton and then bait against the bank, oxygenates the water, and scatters the light so fish move shallower and commit harder.

Fish the windy side. The slack side of a causeway on a windy day is usually dead, no matter how good it looks. Point the bow into the wind, use the trolling motor to hold position, and cast ahead of the boat rather than fighting the drift.

Where to start on depth

Start at the bottom of the rock, not the top. On most causeways the rip-rap runs out somewhere between ten and eighteen feet and meets a softer basin bottom. That base line is the single most reliable piece of a rip-rap bank in midsummer — it’s the edge fish travel along, and it’s where they sit when the sun is high.

From there work up. Check the top three to six feet at first and last light, in wind, and any time cloud rolls in.

Depth also sorts the species for you. Largemouth hold shallower and tighter — they’ll be against the rock, in the gaps, or on whatever piece of wood washed up against it. Walleye live on the deep edge, right where the rock dies into soft bottom, and they turn on as the light goes. If your afternoon bass bite fades, don’t leave — slide out ten feet and fish that base line into dusk.

The rotation

1. Squarebill or lipless crankbait — parallel, deliberately banging into the rock. The deflection is what triggers them. Fast, covers the bank, tells you where they are.
2. 3/8 oz football jig with a green pumpkin craw trailer — dragged down the slope, not hopped. The football head crawls over rock instead of wedging in it.
3. Texas-rigged craw or beaver — pitched into specific gaps around the big boulders and the bridge pilings. Slow and vertical.
4. Ned rig — the cleanup tool on the base line and for anything that followed the crankbait and refused it. This is your best answer at two in the afternoon in slick calm.
5. Drop shot — on the steepest section, straight down, when you can see fish suspended off the rock face on electronics.
6. Walking topwater — along the top of the rock at first and last light. Worth twenty minutes at each end of the day, no more.

The mistakes, including mine

• Fishing the whole bank at one speed. Rip-rap rewards speeding up between the good spots and slowing right down on them. Grinding a jig along 400 metres of identical rock is a way to fish for two hours and touch nothing.
• Casting at the bank instead of down it. The most common one, and the most costly.
• Ignoring the deep third. Most people fish the top four feet because it’s visible. The fish are usually below it.
• Leaving when the wind comes up. That’s the moment to arrive, not to go.
• Hanging up constantly and blaming the rock. If you’re losing baits, you’re hopping when you should be dragging, or fishing straight up the slope instead of along it. A football head and a sideways drag solves most of it.
• One pass and gone. A causeway that’s dead at noon can be the best spot on the lake at seven. Come back.

A rip-rap bank in July isn’t a spot, it’s about six spots hidden inside a long grey line. Idle it, find the rock-size change and the transitions, fish the base of the rock first, fish parallel, and be there when the wind turns on. That’s most of it.