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Pohoiki Boat Ramp - Key Steps Identified and Dredging Everything

WRITTEN AFTER CONVERSATION WITH JOHN KATAHIRA, PROJECT LEAD ON THE POHOIKI BOAT RAMP DREDGE. Last month, John Katahira from Limtaco Consulting Group led a presentation in Pāhoa where three different options for dredging the Pohoiki Boat Ramp were shared for public comment. After much discussion with the community, all the three options presented for removing the tons of sand inundating Pohoiki Bay were deemed inadequate. Instead, the decision has been made to pursue a 4th option - the dredge everything option. The plan now is to take out as much of the sand and rock out of Pohoiki Bay as possible, starting with the edge of the new lava flow northeast of the beach and continuing down to the southern end of Second Bay. In an article posted by West Hawaiʻi Today on August 29th, DLNR-DOBAR Project Engineer Finn McCall was quoted as saying “our goal is to dredge as much as we can while still being allowed under our permit.” Known as the Nationwide Permit, this general permit authorizes activities across the country for existing coastal maintenance and falls under the US Army Corps of Engineers (USACE). In a subsequent meeting after the article was printed, it was made known that USACE is open to the idea of dredging everything under the Nationwide Permit, but cannot make that determination without an official application. That meeting made the State and consultants aware of the determination made by USACE that Federal jurisdiction does not extend inland of the high-water mark, meaning the inundation of sand in 2018-2019 altered the jurisdiction of Pohoiki bay. An estimated 70% of the loose material to be removed would therefore be within the State’s jurisdiction. Currently, the Pre-Design Draft Report on the Pohoiki dredge is being revised to include the 4th option to “dredge everything”, and can be expected to be completed and released to the public around the end of September. A preliminary cost estimate of $40 million places the “dredge everything” option as more expensive than simply digging a channel through the sand and hoping it doesn’t refill (Option 1 & 2), but less expensive than building jetties to protect the bay, represented by Option 3 presented at the August 18th community meeting in Pāhoa. However, since money for this project has not been allocated by the State, work will likely have to wait for the next legislative session for funding, which could allow dredging to begin sometime in summer 2023. FEMA could reimburse the State of Hawaiʻi for up to 75% of the project’s cost, but the State will need to support the full cost of the project up front. The “dredge everything” option may need to be scaled back depending on funding being secured. These are the key steps needed to restore sustainable access to the third most productive fishery area in the State prior to the 2018 eruption, relieve the burden on community fishermen, and to continue the valued cultural traditions that have led Pohoiki to be treasured by so many. Image is a crude idea of the preliminary scope of the dredging project under option 4. This is unofficial, but it is roughly the looking area to be removed under "dredge everything".

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Episode 28

Episode 28

Update: Episode 28 of the ongoing Halemaʻumaʻu eruption ended abruptly at 1:20 p.m. HST on July 9, 2025, after 9 hours of continuous fountaining, the final 8 of which were high fountaining. The north vent stopped erupting at approximately 1:20 p.m. HST, marking the end of the episode. The south vent did not appear to activate at all during this episode and has been completely covered by new deposits. The growing cone around the north vent has begun to connect with the top of the surrounding cliff in some places. Lava fountains reached up to approximately 1200 ft (365 m) during this episode. Volcanic gas emissions have greatly decreased since the end of fountaining. Lava flows from this episode on the floor of Halemaʻumaʻu within the southern part of Kaluapele (Kīlauea caldera) may continue to exhibit slow movement or incandescence as they cool and solidify over the coming days. Slumping of molten cone material around the vent may also continue for the next 24 hours and can produce small, localized lava flows. The Uēkahuna tiltmeter (UWD) recorded about 15 microradians of deflationary tilt during this episode. The end of the eruption was coincident with a rapid change from deflation to inflation at the summit and a decrease in seismic tremor intensity. --------------------------------------- Episode 28 of the ongoing Halemaʻumaʻu eruption began at 4:10 a.m. HST on July 9 and is currently exhibiting a vent overflow and fountains reaching roughly 150 feet (45 meters). Past episodes have produced incandescent lava fountains over 1000 feet (300 meters) high that result in eruptive plumes up to 20,000 feet (6000 meters) above ground level. High fountaining associated with this episode has not yet begun but is expected to start soon, as tremor, deflation, and fountain height are all increasing. According to USGS weather stations just southwest of the summit, winds are blowing from the north-northeast direction at approximately 15 miles per hour, which suggests that volcanic gas emissions and volcanic material will be distributed south-southwest. Such trade winds typically turn more to the northeast during daylight hours. All eruptive activity is confined to Halemaʻumaʻu crater within Hawaiʻi Volcanoes National Park Three Kīlauea summit livestream videos that show eruptive lava fountains are available here: https://www.youtube.com/@usgs/streams

Ryan Finlay · 1 month ago

Episode 24

Episode 24

Episode 24 of the ongoing Halemaʻumaʻu eruption began at 8:55 PM HST on June 4 and is currently fountaining from the north vent. Episode 24 was preceded by sporadic spatter, gas pistoning, and hydrogen flames that began on the morning of June 3. At approximately 8:55 PM HST, episode 24 began with low dome fountaining accompanied by lava flows onto the crater floor. Small sustained lava fountains, less than about 100 feet (30 meters) high, began erupting from the north vent around 9:15 PM. Activity increased again around 10:10 PM, when fountain heights increased to 325 feet (100 meters) and by 10:40 reached over 980 feet (300 meters). Additionally, the fountain generated a plume that reached 16,500 feet (5,000 meters) above ground level by 10:50 PM and is increasing. At a tiltmeter near Uēkahuna (UWD), inflationary tilt reached just over 14 microradians since the end of the last episode; slightly more than the amount of deflationary tilt in episode 23. Seismic tremor began increasing and tilt at UWD switched from inflation to deflation at about 9:00 PM HST, close in time to the beginning of low fountaining. Most episodes of Halemaʻumaʻu lava fountaining since December 23, 2024, have continued for around a day or less and have been separated by pauses in eruptive activity lasting generally at least several days.

Ryan Finlay · 2 months ago

Episode 18 Fountains Have Begun

Episode 18 Fountains Have Begun

Episode 18 high fountains have started!

Ryan Finlay · 4 months ago

Episode 17 Has Started

Episode 17 Has Started

Episode 17 of the ongoing Halemaʻumaʻu eruption began at 10:15 p.m. HST on April 7, 2025 with the start of lava overflowing from the south vent. Low spatter fountains from the south vent have been increasing from initial heights of 15-30 feet to 30-60 feet by 3:00 am HST on April 8. Tremor continues to gradually increase as well and is accompanied by slow deflation of the summit. - USGS Volcanoes

Ryan Finlay · 4 months ago

Episode 16 Has Ended

Episode 16 Has Ended

Episode 16 of the ongoing Halemaʻumaʻu eruption ended at 12:03 p.m. HST on April 2 when high fountaining at the south vent stopped. Fountains from the south vent sustained heights of 600-700 feet (180-210 meters) for over 23 hours, then dropped to less than 300 feet (90 meters) at 9:50 a.m. HST this morning, April 2. Overall, episode 16 lasted just over 37 hours with the last 25 hours and 39 minutes consisting of fountains from the south vent. During episode 16, lava flows covered over 50% of the floor of Halemaʻumaʻu within the southern part of Kaluapele (Kīlauea caldera). Weak winds also resulted in deposition of Pele's hair and tephra in closed areas of Hawai'i Volcanoes National Park and on Highway 11 between mile marker 35 and 37 on April 1. Additional details about the eruption were posted earlier in the March 31 Status Report and the April 1 Status Report and the April 1 Daily Update for Kīlauea along with the April 2 Daily Update for Kīlauea. The UWD tiltmeter recorded just over 14 microradians of deflation during episode 16, with 11 microradians lost on the SDH tiltmeter. Deflation rate was constant throughout the first part of the eruption reflecting the stable nature of activity from the south and north vents. The deflation rate slowed slightly after the north vent shut down April 1 at 9:22 p.m. HST. The end of the eruption was coincident with a rapid change in tilt from deflation to inflation at the summit and a decrease in seismic tremor intensity when the fountains ceased at 12:03 p.m. HST. Each episode of Halemaʻumaʻu lava fountaining since December 23, 2024, has continued for at least 13 hours, and up to 8 days, and episodes have been separated by pauses in eruptive activity lasting less than 24 hours to 12 days. Timeline of eruption episodes since December 23, 2024: https://www.usgs.gov/volcanoes/kilauea/science/eruption-information Two Kīlauea summit livestream videos are available here: Kīlauea Volcano, Hawaii (West Halemaʻumaʻu crater) v1cam and Kīlauea Volcano, Hawaii (East Halemaʻumaʻu crater)v2cam No changes have been detected in the East Rift Zone or Southwest Rift Zone. HVO continues to closely monitor Kīlauea and will issue an eruption update tomorrow morning unless there are significant changes before then. Kīlauea Volcano Alert Level/Aviation Color Code remain at WATCH/ORANGE. All current and recent activity is within Hawaiʻi Volcanoes National Park. Via USGS Volcanoes

Ryan Finlay · 5 months ago

Episode 16 High Fountains Have Started

Episode 16 High Fountains Have Started

The high fountaining stage of episode 16 has begun just now! “High fountaining began from the south vent at 10:24 am HST on April 1. The change was preceded by about 5 minutes of steadily increasing vigor. South vent fountains are currently about 200 feet (70 meters) high. No change at north vent.”

Ryan Finlay · 5 months ago