| Marsh Creek | |
| Map Size: | 300 |
| Pushpin Map: | USA Idaho#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of the mouth of Marsh Creek in Idaho |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Idaho |
| Subdivision Type4: | County |
| Subdivision Name4: | Bannock County, Idaho |
| Length: | 56miles[1] |
| Source1 Location: | near Red Rock Pass, Bannock County, Idaho |
| Source1 Coordinates: | 42.4033°N -112.0269°W[2] |
| Source1 Elevation: | 5157feet[3] |
| Mouth: | Portneuf River |
| Mouth Location: | near Inkom, Bannock County, Idaho |
| Mouth Coordinates: | 42.7944°N -112.2578°W |
| Mouth Elevation: | 4518feet |
Marsh Creek is a 56adj=midNaNadj=mid[1] tributary of the Portneuf River in Bannock County, Idaho, United States.[2]
Beginning at an elevation of 5157feet[3] near Red Rock Pass, Marsh Creek flows generally north near the communities of Downey and Arimo. It parallels the Portneuf River starting near McCammon, reaching its mouth near Inkom,[4] at an elevation of 4518feet.[2] It is roughly paralleled by Interstate 15/U.S. Route 91 in Idaho for most of its length.[4]