If "State Creek" is the name of a specific creek, then it is a proper noun and should be capitalized: State Creek.
If "state creek" refers to any creek within a state, then it is a common noun and should not be capitalized: state creek.
For example:
* Proper noun: "We went hiking along State Creek."
* Common noun: "The map showed a state creek running through the valley."
To determine whether "State Creek" is a proper noun, consider the context of the sentence and whether it refers to a specific creek or a general concept.