Limestone Hills / Fort Harrison · Montana · LCNHT core
Limestone Hills Training Area / Fort Harrison
"Gates of the Mountains", named by Lewis, July 19, 1805.
Blackfoot River · Lewis & Clark Pass region · MT
Sample 360° capture
Clearwater to Dunnigan Gulch, Blackfoot River MT.
A live example of what the Limestone Hills Training Area / Fort Harrison corridor would look like after capture, drawn from existing Terrain360 work in the region.
Corridor narrative
Why this corridor.
Limestone Hills Training Area near Townsend and Fort Harrison near Helena bracket one of the most scenic stretches of the Missouri, Canyon Ferry Reservoir into the dramatic limestone walls Lewis christened the Gates of the Mountains. Three reservoirs (Canyon Ferry, Hauser, Holter) link 81 river miles of LCNHT-direct corridor before the river runs free toward Cascade.
Adding the Helena-Lewis & Clark National Forest OHV/UTV systems and the Continental Divide National Scenic Trail through the Lewis & Clark Pass region gives this corridor the deepest stack of historic and recreational assets in the program: a Missouri-River LCNHT mainstem, a CDNST historic-trail crossing, and four established marinas/launch areas.
Fort Harrison's REPI buffer status (Prickly Pear Land Trust) and the public-access posture of every shoreline asset make this corridor highly executable, and the historical density gives it strong interpretive payload.
Lewis & Clark connection
Directly on the LCNHT Missouri River corridor. Gates of the Mountains (named by Lewis, 1805), Canyon Ferry, Hauser and Holter reservoirs are all bona fide Missouri-River LCNHT assets.
Directly on the LCNHT Missouri River corridor. Gates of the Mountains was named by Meriwether Lewis on July 19, 1805. Canyon Ferry, Hauser, and Holter reservoirs are all bona fide Missouri-River LCNHT assets. The CDNST near Lewis & Clark Pass adds a historic trail-crossing tie-in.
Limestone Hills is ~3 mi W of Townsend; Fort Harrison ~41 mi NW near Helena. CDNST near Lewis & Clark Pass adds a historic trail-crossing tie-in.
Final deliverables
What the partnership receives.
Hosted 360° portal
Web-based interactive map showing pan-and-explore imagery of both riverbanks and every mapped trail. Mobile + desktop. Embeddable in any partner site.
Geo-referenced imagery dataset
Equirectangular panoramas + GPS tracks delivered to the installation INRMP team and the NPS Trail Office for reuse in REPI reporting, ESA Section 7, and outreach.
Printable corridor maps
Asset index keyed to the imagery - suitable for visitor information, grant deliverable documentation, and partner co-branding.
L&C interpretive layer (optional)
Waypoint overlay tying the corridor to journal entries and historic sites - Tower Rock, Gates of the Mountains, the Falls portage, the Pacific arrival.
Asset inventory
Every asset, costed.
Each row is a discrete 360-mapping unit. Rivers are priced per mile of both-bank boat capture; trails per mile; access sites as fixed 360 nodes.
| Recreation asset | Type | Miles | LCNHT | Access | Est. cost |
|---|---|---|---|---|---|
| Canyon Ferry Reservoir shoreline ~3–5 mi | River | 30 | Direct | Public | $45,000 |
| Missouri River — Gates of the Mountains (Holter) ~20 mi N of Helena | River | 24 | Direct | Public | $36,000 |
| Hauser Reservoir ~13 mi E of Helena | River | 15 | Direct | Public | $22,500 |
| Holter Lake ~30 mi N of Helena | River | 12 | Direct | Public | $18,000 |
| Missouri River — Holter Dam to Cascade (Craig reach) ~35–50 mi N | River | 35 | Near | Public | $52,500 |
| Dearborn River — Hwy 434 to Missouri confluence ~50 mi N | River | 19 | Near | Public (confluence only) | $28,500 |
| Continental Divide NST — Helena Ranger District Helena vicinity | Trail | 67 | Near | Public | $56,950 |
| OHV/UTV route network — Helena-Lewis & Clark NF Helena/Elkhorn | Trail | 40 | Near | Public | $34,000 |
| Hellgate Ridge Trail (multi-use/OHV) Helena vicinity | Trail | 8 | None | Public | $6,800 |
| Strawberry Ridge Trail #311 Helena vicinity | Trail | 6 | None | Public | $5,100 |
| Mount Helena trails In/near Helena | Trail | 8 | None | Public | $6,800 |
| Black Sandy State Park (Hauser Lake ramp) ~13 mi E of Helena | Access | - | Direct | Public | $1,500 |
| The Silos Recreation Area & Marina (Canyon Ferry) Near Townsend | Access | - | Direct | Public | $1,500 |
| Indian Road Recreation Area (S. Canyon Ferry) Near Townsend | Access | - | Direct | Public | $1,500 |
| Gates of the Mountains Marina ~20 mi N of Helena | Access | - | Direct | Public | $1,500 |
Corridor map (accent)
Satellite view of the corridor footprint, with rivers, trails, and access sites color-coded. Real corridor traces will land in v2; pins here are placeholder anchors at the installation.
Related Terrain360 work
