# Event Details - **Event Name**: East Portal & Adams Tunnel History Hike - **Event Start and End Date**: Fri, 18 Sep, 2026 at 09:00 am – Fri, 18 Sep, 2026 at 03:00 pm (-06:00) - **Event Description**: Learn about the Colorado-Big Thompson Project, Alva B. Adams Tunnel, and visit East Portal on this guided history hike!About this EventJoin the Rocky Mountain Conservancy for a hike exploring the history beneath Rocky Mountain National Park. This 5-mile round-trip hike from East Portal to Sprague Lake gains 750 feet in elevation and highlights the remarkable story of the Alva B. Adams Tunnel and the Colorado-Big Thompson Project.Built during the New Deal era, the project diverted water from the Colorado River to the eastern plains—providing irrigation, hydroelectric power, and economic relief during a time of national hardship.Along this moderate hike, we’ll discuss the ongoing balance between preservation and progress in the Park’s history. Our hike begins with a steep climb over a short distance, with occasional areas of loose ground, before leveling off for the remainder of this out and back route.Who: Participants ages 16 and up.Program Level: Challenging – These programs are ideal for people accustomed to hiking longer, steeper trails at elevations above 8,000 feet. Programs will include travel over rough, loose, and uneven terrain. Participants should be able to hike at a pace of 1.5 miles per hour while carrying their own food, water, and layered clothing.This program is entirely field based.When: Friday, September 18th from 9:00am to 3:00pm. Ending time is approximate and depends on traffic conditions and the pace of the group. Please leave yourself some free time after the hike in case we get back later than expected.Where: We will meet at the Estes Park Visitor Center at 500 Big Thompson Ave, and travel together to the trailhead in Conservancy vehicles. Look for a large white van with Rocky Mountain Conservancy logos in the visitor center parking lot. Registration includes all park fees and permits.What to Bring:Bag lunchSun protectionWarm layers (weather depending)Waterproof layer(s)Water (2 liters recommended)Sturdy trail shoes or hiking bootsRefund Policy:Cancellations made more than 30 days prior to the start of the course are eligible for a full refund. Cancellations made fewer than 30 days in advance are not eligible for a refund.Our programs proceed rain or shine, and participants should be prepared for inclement weather. However, should we decide to cancel a program due to unsafe weather or emergency conditions, we will notify participants by email and automatically issue full refunds.Conservancy members get 10% off individual registration when you use the discount code in your membership email!Not a member of the Conservancy? Learn more and join here: If you have questions about this course, please contact the Field Institute by email at education@RMConservancy.org or by phone at 970-586-3262. - **Event URL**: https://allevents.in/estes-park/east-portal-and-adams-tunnel-history-hike/100001926373658469 - **Event Categories**: trips-adventures, trekking, workshops - **Interested Audience**: - total_interested_count: 0 ## Ticket Details - **Ticket Price Range**: min: 85.31, max: 85.31, currency: USD ## Event venue details - **city**: Estes Park - **state**: CO - **country**: United States - **location**: Estes Park Visitor Center - **lat**: 40.37882190000001 - **long**: -105.5142921 - **full address**: Estes Park Visitor Center, 500 Big Thompson Avenue, Estes Park, United States ## Event gallery - **Alt text**: East Portal & Adams Tunnel History Hike - **Image URL**: https://cdn-az.allevents.in/events7/banners/46d52add5d8cf3ce8b1594a718aaf6beb3deb0c6461245ae83f69661fed53834-rimg-w1200-h600-dc191c12-gmir.jpg?v=1764384398 ## FAQs - **Q**: When and where is East Portal & Adams Tunnel History Hike being held? - **A:** East Portal & Adams Tunnel History Hike takes place on Fri, 18 Sep, 2026 at 09:00 am to Fri, 18 Sep, 2026 at 03:00 pm at Estes Park Visitor Center, 500 Big Thompson Avenue, Estes Park, United States. - **Q**: How much do tickets cost for East Portal & Adams Tunnel History Hike? - **A:** Tickets for East Portal & Adams Tunnel History Hike are priced at USD 85 per person. Here's a full breakdown of available ticket types:Ticket TypePriceAvailabilityIndividual RegistrationUSD 85 + USD 5 feeAvailable - **Q**: Who is organizing East Portal & Adams Tunnel History Hike? - **A:** East Portal & Adams Tunnel History Hike is organized by Rocky Mountain Conservancy Education Team. ## Structured Data (JSON-LD) ```json [ { "@context": "https://schema.org", "@type": "Event", "name": "East Portal & Adams Tunnel History Hike", "image": "https://cdn-az.allevents.in/events7/banners/46d52add5d8cf3ce8b1594a718aaf6beb3deb0c6461245ae83f69661fed53834-rimg-w1200-h600-dc191c12-gmir.jpg?v=1764384398", "startDate": "2026-09-18T09:00:00-06:00", "endDate": "2026-09-18T15:00:00-06:00", "url": "https://allevents.in/estes-park/east-portal-and-adams-tunnel-history-hike/100001926373658469", "eventStatus": "https://schema.org/EventScheduled", "location": { "@type": "Place", "name": "Estes Park Visitor Center", "address": { "@type": "PostalAddress", "streetAddress": "500 Big Thompson Avenue", "postalCode": "80517", "addressLocality": "Estes Park", "addressRegion": "CO", "addressCountry": "US" }, "geo": { "@type": "GeoCoordinates", "latitude": "40.37882190000001", "longitude": "-105.5142921" } }, "eventAttendanceMode": "https://schema.org/OfflineEventAttendanceMode", "description": "Learn about the Colorado-Big Thompson Project, Alva B. 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