22 mapped river miles, draining 17 square miles, in the Lake Erie Tributaries basin watershed. 1 USGS gauge report water temperature on it, and this page reads it.
50°F and colder is cold, through cold-transitional and cool, to warm above 70°F — the same four bands, breaking at 58, 64 and 70°F, that the app paints. Grey is water nobody has measured.
Live from the USGS — every pill above is live, so the numbers you are reading are the latest continuous readings at each gauge. Provisional and unreviewed, as all real-time data is. If that fetch cannot happen — you are offline, or the USGS is down — the pills fall back to the last value we cached, 30 September 2026, 14:04 UTC.
Each gauge carries a July mean built from its own daily record — 8 Julys, 2019–2026, measured rather than modelled. A July mean is what decides which of the four bands a stretch of water belongs to, because July is when a trout river either holds or does not.
| Reach | July mean | Band | Groundwater |
|---|---|---|---|
|
Upstream Pool, near Erie, Pa RM 21.9–2.0 |
73.6 °F | warm | low |
Every gauge sits at the bottom of its segment, so each number is the warm end and the water above it runs colder. ±2.48 °F on the fit.
The Walnut Creek is a Lake Erie tributary with 21.3 miles of run corridor on it — salmon, steelhead and lake-run brown trout, on their own calendar and under their own rules. Run timing, species and access on the Walnut Creek →
PA DEP classifies this water as Cold Water Fishes. The management tier on those reaches is Cold Water Fishes. This is a designation of the fishery, not the season and creel rules — those change yearly and live with the agency.
River miles are measured above the mouth, along the mapped mainstem. The reach breaks are the gauges, which is also how the temperature model divides the river.
| Reach | Miles | July mean | Access on it |
|---|---|---|---|
|
RM 21.9–2.0 down to Upstream Pool, near Erie, Pa |
19.9 | 73.6 °F | 1 site — Dutch Road Access, Walnut Creek |
2 mapped access sites on the mainstem: 1 walk-in, 1 boat or canoe launches. Source: PA DEP.
Every gauge on the mainstem, upstream first. Links go to the USGS monitoring-location page for the site.
6 units of public or open-access land touch this river, 189 acres in total. Acreage is the whole unit, not the part beside the water.
| Unit | Owner | Acres |
|---|---|---|
| Walnut Creek — Public Fishing Right Over Private Ground | PFBC | 65 |
| Walnut Creek — Pfbc Holds The Ground | PFBC | 41 |
| Veteran's Park | city land | 21 |
| Veteran's Park | county land | 21 |
| Cassidy Property Acquisition | city land | 21 |
| Dutch Road Access, Walnut Creek | another state agency | 19 |
PA DEP designates this as trout water — Cold Water Fishes — without naming the species. No fish survey or stocking record for this water is in the files this site reads.
The measured record behind every temperature band on this page: the mean of the daily means for July, at each gauge, over the years USGS has one.
| Gauge | July mean | July range | Julys |
|---|---|---|---|
| Upstream Pool, near Erie, Pa | 73.6 °F | 16.6 °F | 8 |
1 named stream meets this one. Confluence miles are above the mouth; the longest twelve are listed.
Walnut Creek sits in HUC 8 04120101, the Lake Erie Tributaries basin, and drains 17 square miles, Strahler order 3 at the mouth. 31 NHD reaches carry the name for 22.0 miles in total — more than the 21.9 miles of drawn mainstem, because NHD counts side channels and braids as their own reaches.
The closest 6 rivers on this site, straight-line from the middle of this one — not drive time.