Twelve Mile Creek
Bluestone falls water in Harborcreek: the smallest, prettiest, slowest-clearing of the east-side steelhead creeks.
← All stream pages · Tributary map
Current conditions
Gauge: USGS 04213152 — Walnut Creek Upstream Pool (USGS 04213152) - shore-wide timing proxy Proxy gauge
Reading baked into this page when it was last updated at 2026-10-14 20:30 — checking the live USGS feed now…
| Window | Reading |
|---|---|
| Too low | Walnut gauge under 15 cfs; Twelve Mile gin clear over the bluestone |
| Low and fishable | Walnut 15 - 50 cfs; fish in the falls pools |
| Prime | Walnut 50 - 150 and falling, PLUS 2-4 days for Twelve Mile to clear |
| High and fishable | Foam lines below the falls while the creek is still stained |
| Blown out | Walnut over 250, or Twelve Mile milky at the Route 5 crossing |
The bluestone ledges make color easy to read: when you can just make out the dark ledge rock a foot down in the falls pools, it is right.
2-4 days. Pair it with Sixteen Mile as the back end of every rain cycle.
How the bands were set: Twelve Mile Creek has NO stream gauge (historic USGS sites near Moorheadville are water-quality records only). Timed off the Walnut Creek gauge with the east-side lag: PFBC Large runoff class, 2-4 days after rain - tied with Sixteen Mile as the last water to clear on the shore (house reference).
Gauge page: USGS monitoring location 04213152
Season playbook
Resolved from today's date — the current season is highlighted. On the live site this re-resolves in your browser.
Fall (Oct - Nov)This season
The water: Late to clear, quick to skinny again - short green windows.
Fish present: Steelhead in the falls pools and lower creek.
How to fish it: Day 3-4 timing; pool to pool, small offerings.
Winter (Dec - Feb)
The water: Clear, cold, ledgy; ice on the pool edges.
Fish present: Holdover steelhead.
How to fish it: Deepest falls pool, midday, tiny patterns.
Spring (Mar - Apr)
The water: Suckers and the last steelhead; upper creek trout season opens.
Fish present: Steelhead, suckers, stocked trout up-creek.
How to fish it: Sucker Spawn low; nymphs in the Moorheadville reach.
Summer (May - Aug)
The water: Low, clear bluestone water.
Fish present: Stocked and wild trout up-creek.
How to fish it: Dawn and dusk, terrestrials, light tippets.
On now — hatch & forage for October
- Steelhead egg drift — Small Glo-Bugs, beads
- Crayfish — Crayfish patterns, Woolly Buggers
Full calendar
| Item | Window | Size | Patterns | Notes |
|---|---|---|---|---|
| Steelhead egg drift | Oct - Dec | eggs 6-8 mm | Small Glo-Bugs, beads | The falls pools hold egg-eaters on the late cycle. |
| Little black stoneflies | Jan - Mar | #16-20 | Black stonefly nymph | Bluestone riffles produce stones all winter. |
| Midges | Nov - Mar | #20-26 | Zebra Midge | For gin-clear pool fish. |
| Sucker spawn | Mar - May | eggs 6-8 mm | Sucker Spawn | Lower creek riffles in spring. |
| Spring mayflies and caddis (upper trout water) | Apr - Jun | #12-18 | BWO, Pheasant Tail, Elk Hair Caddis | Typical windows per PA regional hatch charts, for the Moorheadville stocked reach. |
| Crayfish | May - Oct | #6-10 | Crayfish patterns, Woolly Buggers | Resident forage in the falls pools and over the bluestone ledges. |
Weather & conditions playbook
The row matching the live flow band is highlighted when the gauge answers.
| Condition | What changes | Tactics | Flies | Verdict |
|---|---|---|---|---|
| High and off-color | Milky over the bluestone for days - the joint-slowest clear on the shore. | Fish the rotation elsewhere; calendar Twelve Mile for day 3-4. | - | Stay home. |
| Prime stain and falling (day 3-4) | Ledge rock just visible a foot down in the pools: perfect. | Pool appointments: two good drifts each, small patterns. | Small eggs, pheasant tails. | Go - briefly and precisely. |
| Low and clear | Fish visible and terrified in the falls pools. | First light, from below the pool, no wading into it. | Midges, single eggs. | Marginal - dawn only. |
| Cold snap | Ice shelves on the ledges; dangerous footing. | Skip the ledges; fish the deepest pool from the bank. | Tiny eggs. | Marginal - watch your footing. |
| Warm rain in fall | Fish enter; your window opens days later. | Scout color at Route 5 daily. | Eggs ready for the drop. | Go on the delayed drop. |
| Post-front bright | Shade pockets under the ledges hold the only relaxed fish. | Ledge shade, natural patterns. | Pheasant tails, small nymphs. | Fishable in shade. |
Access points
Lower creek and lakefront (Harborcreek Township)
Parking: Walk-in lakefront access in Harborcreek Township near the mouth; no developed lot - obey township signs and do not block drives or lanes.
Mouth and first pools. Much of the lower bank is private - fish the open water and ask where you are unsure.
Route 5 bridge reach · Map pin
Parking: Bridge crossing on Route 5 in Harborcreek; limited roadside parking - keep clear of traffic.
The color-check stop: read the creek here before committing. Falls pools and ledge water within walking distance of the crossing where banks are open.
Moorheadville reach (upper stocked water) · Map pin
Parking: Road crossings near Moorheadville; park off the pavement, respect farm lanes.
Upper creek: stocked trout water in a rural bluestone valley. A different, quieter game than the steelhead reach - know which rules apply to the section you are standing in.
Access changes with postings and seasons — respect every sign, and confirm current PFBC regulations before fishing.
The full Twelve Mile Creek deep dive — $9.99
The complete guide: access map with GPS pins, the full flow-band tactics, hatch calendar, weather playbook, regulations, and sources — a living guide, refreshed as conditions and data change, with refreshed editions free to buyers.
Not sure yet? Preview a full guide free: San Juan River sample (PDF) — a complete guide, so you can see exactly what you get.