New York's access file puts 4 public sites on the South Branch Grass River — 4 walk-in sites, spread over the counties it runs through. 4 blocks of public land front the South Branch Grass River, and 24.4 of its 24.1 mapped miles run through them.
| Site | Type | River mile | County |
|---|---|---|---|
| Grass River | walk in | 17.6 | St. Lawrence |
| First Brook at Clare | walk in | 9.8 | St. Lawrence |
| South Branch Grass River angler parking | walk in | 4.9 | — |
| Grass River at Russell | walk in | 0.9 | St. Lawrence |
4 walk-in, 0 launches, from New York's own access file. River mile is measured up from the mouth along this river's drawn axis.
Ownership from PAD-US as the state publishes it. Where a block has its own page, the name links to it. The river miles are how far this river's drawn axis runs inside each block, measured here; the acreage is the whole unit's, most of which is nowhere near this water.
South Branch Grass River — live water temperature, regulations and access