What Slate Run Offers and Where to Fish It

Slate Run is a limestone creek in Lycoming County that flows north into the West Branch Susquehanna River near Williamsport. The stream runs clear and cold year-round, fed by springs and groundwater seepage through limestone geology. It holds smallmouth bass in the lower sections and native brook trout in the upper reaches, with some brown trout mixed in the middle. The creek is roughly 20 miles long, but the most productive water for public access runs from the village of Slate Run downstream to the confluence.

The stream is narrow—typically 20 to 40 feet wide—and flows through a mix of open farmland and wooded banks. Current is moderate and steady. Depth ranges from ankle-deep riffles to pools 4 to 6 feet deep. The limestone bottom is rocky and stable, with good cover from boulders and undercut banks. Water clarity is usually excellent unless heavy rain muddies it temporarily.

Key Takeaways

  • Slate Run holds native brook trout in the upper creek and smallmouth bass in the lower sections, with brown trout in between.
  • The stream is accessible from multiple pull-offs along Slate Run Road, which runs parallel to the creek for most of its length.
  • Spring and fall are the most reliable seasons; summer water can warm above 70 degrees in the lower sections, stressing trout.
  • A Pennsylvania fishing license is required; the stream is open to year-round fishing but follows special regulations for trout in certain sections.
  • Wading is straightforward on the rocky bottom, but water levels can rise quickly after rain, making the creek dangerous to cross in some spots.

Access Points and How to Reach Them

Slate Run Road (also called T-Road 447) runs the length of the creek and provides the main access. The road is a narrow, paved two-lane that follows the stream closely from the village of Slate Run downstream to near the Susquehanna confluence. Parking is informal—pull-offs and wide shoulders exist at several spots, but there is no dedicated parking area or boat launch.

The upper creek near the village of Slate Run is easiest to reach. Park along the road shoulder near the bridge at the village center and walk upstream or downstream from there. The middle sections have fewer obvious pull-offs but can be accessed by parking at wide spots along the road and walking down the bank. The lower creek near the Susquehanna confluence is accessible from pull-offs closer to Williamsport, though the road becomes less obvious as you approach the river.

There is no formal public land ownership along most of Slate Run; access depends on parking on the road and fishing from the streambed itself. Respect posted property and do not cross fences or trespass on private land. The creek is narrow enough that you can fish most of it without leaving the water once you are in.

Seasonal Patterns and What Fish Are Feeding

Spring (April through May) brings the best overall fishing. Water temperatures climb from the 40s into the 50s and low 60s. Trout are active and hungry after winter. Nymphs and small streamers work well. Smallmouth begin to move into shallower water as the creek warms. Runoff from rain can muddy the water, so fish the clearer sections or wait a day or two after heavy rain.

Summer (June through August) is inconsistent. The lower creek warms above 70 degrees by mid-July, which stresses trout and sends them deep into pools or springs. The upper creek stays cooler and holds fish better. Early morning and evening are more productive than midday. Smallmouth are active and aggressive in the lower sections. If you are targeting trout in summer, focus on the upper creek or fish early before the sun heats the water.

Fall (September through October) is excellent. Water cools back into the 50s and 60s. Trout become active again. Smallmouth feed heavily before winter. Streamers and nymphs both work. October can be outstanding, especially after a cool night when water temperatures drop. Leaves begin to fall and cover the water, which can make wading tricky but also provides good cover for fish.

Winter (November through March) is slow but possible. Water temperatures drop into the 30s and 40s. Fish move to deeper pools and slow water. Nymphs fished dead-drift work better than streamers. Smallmouth are sluggish. Ice can form along the banks, making wading hazardous. Many anglers skip winter on Slate Run and fish the lower Susquehanna instead.

What Tackle and Flies Work Best

For trout, bring a 7 to 8-foot rod rated for 4 to 6-weight line. The creek is small enough that you do not need distance casting, but you do need accuracy and control. Nymphs are the most reliable year-round: Pheasant Tail, Hare's Ear, and small Caddis nymphs in sizes 14 to 18 work in most conditions. Streamers like Woolly Buggers and small Sculpins (sizes 10 to 14) work well in spring and fall, especially in deeper pools. Dry flies are effective in late spring and early fall when mayflies and caddis are hatching, but nymphs will catch more fish overall.

For smallmouth, use a 6 to 7-foot rod rated for 5 to 7-weight line. Smallmouth in Slate Run are not large—most run 8 to 12 inches—but they are aggressive. Small streamers (sizes 8 to 12) in black, brown, or olive work well. Poppers and small topwater lures can be effective in summer evenings. Spinning tackle with small crankbaits or spinners also works if you prefer it to fly fishing.

The water is clear, so use light tippet (4X to 5X for trout, 6 to 8-pound test for smallmouth) and keep your approach quiet. Wade slowly and cast upstream or across the current. Let the fly drift naturally with the current rather than stripping it.

Regulations and What You Need to Know Before You Go

You must have a valid Pennsylvania fishing license to fish Slate Run. Licenses are available online through the Pennsylvania Fish and Boat Commission website or at sporting goods stores and bait shops in Williamsport. A one-day license costs less than a full-year license if you are visiting.

Slate Run follows Pennsylvania's trout regulations, which vary by section. The upper creek is managed as a wild trout stream with special rules—check the current regulations on the Fish and Boat Commission website before you fish, as rules change year to year. The lower creek and smallmouth sections follow standard statewide regulations. Possession limits and size restrictions apply; know them before you keep any fish.

The creek is open year-round, but trout season has specific opening and closing dates. Smallmouth can be fished year-round. Catch-and-release is encouraged, especially for native brook trout.

Hazards and Safety on the Water

Slate Run is a small creek, but it can be deceptive. Water levels rise quickly after heavy rain, especially in the lower sections. A creek that is ankle-deep in the morning can be knee-deep or higher by afternoon if rain falls upstream. Never cross the creek in fast water, and always have an exit route planned. If you are unsure about wading, stay on the bank.

The rocky bottom is stable but slippery when wet. Wear wading boots with good grip or felt soles. The banks can be undercut, especially in the middle and lower sections—do not stand on the edge of deep pools. Hypothermia is a real risk in spring and fall when water is cold; wear a wetsuit or wading jacket if you plan to spend hours in the water.

The road alongside the creek is narrow and winding. Park safely and watch for traffic when crossing to access the water. Cell service is spotty in some sections, so let someone know where you are fishing.

Nearby Water and Alternative Options

If Slate Run is crowded or conditions are poor, the West Branch Susquehanna River is just downstream and holds larger smallmouth and walleye. The lower Susquehanna is also nearby and offers different habitat and species. Lycoming Creek, another limestone stream in the same county, is similar to Slate Run but larger and more famous—it can be more crowded but also holds bigger trout.

For a different experience, Pine Creek in the next county north is a larger freestone stream with wild trout and more dramatic scenery. It requires more travel but offers more water and solitude if you are willing to drive.

Frequently Asked Questions

What is the best time of year to fish Slate Run?

Spring (April and May) and fall (September and October) are most reliable. Water temperatures are ideal for trout activity, and smallmouth are feeding heavily. Summer can be slow for trout in the lower creek due to warm water, though the upper creek stays cooler. Winter is possible but slow.

Can I fish Slate Run with spinning gear, or do I need a fly rod?

Spinning gear works fine, especially for smallmouth. Small spinners, crankbaits, and inline spoons are effective. Fly fishing is popular on Slate Run and often more productive for trout, but it is not required. Use whatever tackle you are comfortable with.

Are there any restrictions on where I can fish?

Slate Run is open to public fishing from the streambed, but most land adjacent to the creek is private. Park on the road shoulder and fish from the water. Respect posted property and do not cross fences. Check current regulations on the Pennsylvania Fish and Boat Commission website for any special rules on the section you plan to fish.

Is Slate Run safe to wade?

The rocky bottom is stable and wading is straightforward in normal water levels. Wear wading boots with good grip. Water levels can rise quickly after rain, so never cross in fast water and always have an exit route. Spring and fall water is cold—wear appropriate clothing to prevent hypothermia.

How big are the fish in Slate Run?

Trout typically run 8 to 12 inches, with some reaching 14 to 16 inches in the deeper pools. Smallmouth average 8 to 12 inches as well. This is a small stream with small fish, but they are plentiful and eager to feed. The appeal is the number of fish and the clear water, not trophy size.