BirdTrout

Monocacy River Watershed, Pennsylvania

740 miles of mapped stream across 970 square miles of drainage in Adams county, in 30 named streams. Pennsylvania designates 113 of those miles as trout water, on 15 streams.

Open in BirdTrout
Map key
Public land — where the bank is open to walk and fish
USGS gauge — live water temperature
Water temperature — the colour of every stream in the basin

50°F and colder is cold, through cold-transitional and cool, to warm above 70°F — the same four bands the app paints. On this map the colour is PA DEP's own classification of the stream, not a measurement, except at the gauge dots, which read live. Grey is water PA DEP has not typed.

The watershed in numbers

HUC8 02070009 in the USGS Watershed Boundary Dataset. Every figure below adds up the river pages in this basin — same records, one basin at a time.

740 mi
of mapped stream
1,828 NHD reaches
970 sq mi
drainage area
620,521 acres
0 ac
public land
0 units

Cold, cool and warm water

Pennsylvania publishes no thermal class. What PA DEP publishes is a Chapter 93 designated use — Cold Water Fishes, Trout Stocking, Warm Water Fishes and the rest — which names the fishery a stream is protected for. It is the closest any agency here comes to a temperature without being one, and docs/pa-thermal-fit.md is where the distinction is measured rather than asserted. It covers 83% of this basin's stream miles (612.7 of 740); the rest is untyped and is drawn grey on the map above.

313.5 of the 612.7 typed miles in this basin — 51% — are cold or cold-transitional water. The dominant class is cold.

Every named stream in the basin

All 30 of them, longest first. None has a page of its own yet; all of them are in the app. The class column is PA DEP's designation of that stream. "Now" is the live USGS reading where a gauge stands in that stream.

Stream Miles Class Now Designation
Marsh Creek 27.9 Cold — Cold Water Fishes
Toms Creek 21.3 Cold — Cold Water Fishes
Rock Creek 20.1 Warm — —
Piney Creek 19.5 Warm — —
Middle Creek 17.4 Cold — Cold Water Fishes
Alloway Creek 14.0 Warm — —
Plum Run 12.2 Warm — Cold Water Fishes
Little Marsh Creek 10.6 Cold — Cold Water Fishes
Willoughby Run 9.2 Warm — —
White Run 9.1 Warm — —
Monocacy River 8.3 untyped — —
Friends Creek 7.9 Cold — Cold Water Fishes
Flat Run 7.8 Warm — —
Littles Run 6.7 Warm — —
Miney Branch 6.5 Cold — Cold Water Fishes
Mummasburg Run 6.4 Cold — Cold Water Fishes
Muddy Run 5.5 Cold — Cold Water Fishes
Muskrat Run 5.2 Cold — Cold Water Fishes
Plum Creek 4.2 Warm — —
Lousy Run 4.1 Warm — —
Cattail Branch 4.1 untyped — —
Spring Run 3.6 Cold — Cold Water Fishes
Turkey Creek 3.3 untyped — —
Poplar Spring Creek 2.5 Cold — Cold Water Fishes
Swamp Creek 2.5 Cold — Cold Water Fishes
Rattling Run 2.4 Cold — Cold Water Fishes
Stevens Run 2.3 Warm — —
Chicken Run 1.8 Warm — —
Saint Mary Run 1.7 untyped — —
Green Run 1.4 Cold — Cold Water Fishes

Public land in the watershed

No public land in this basin is joined to the stream network on our map.

Neighbouring watersheds

The subbasins that share a boundary with this one and carry coldwater streams.