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I appreciate your detailed request, but I need to clarify an important limitation with the search results provided.
The search results contain information about the **Upper Coos Recreational Trail** in New Hampshire, which is approximately 9.5–10 miles long and runs from Colebrook to Beecher Falls along the Connecticut River.[1][2][6] However, this trail is **not positioned as a gravel-biking challenge destination**.
According to the sources, the Upper Coos trail is described as:
- **Easy to moderate difficulty**: "easy to follow to the end"[1] with a "reasonably smooth dirt road surface" that is "quite acceptable for mountain biking"[2] - **Straight-forward routing**: relatively flat terrain paralleling the Connecticut River[2] - **Best suited for casual riding**: recommended for hiking, horseback riding, and recreational biking rather than challenging gravel-bike pursuits[1]
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